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712.3179
Mario I. Molina
Mario I. Molina, Yaroslav V. Kartashov, Lluis Torner, and Yuri S. Kivshar
Surface solitons in two-dimensional chirped photonic lattices
12 pages, 7 figures
Phys. Rev. A 77, 053813 (2008)
10.1364/OL.32.002668
null
nlin.PS
null
We study surface modes in semi-infinite chirped two-dimensional photonic lattices in the frame- work of an effective discrete nonlinear model. We demonstrate that the lattice chirp can change dramatically the conditions for the mode localization near the surface, and we find numerically the families of surface modes, in linear lattices, and discrete surface solitons, in nonlinear lattices. We demonstrate that, in a sharp contrast to one-dimensional discrete surface solitons, in two-dimensional lattices the mode threshold power is lowered by the action of both the surface and lattice chirp. By manipulating with the lattice chirp, we can control the mode position and its localization.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:03:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Molina", "Mario I.", "" ], [ "Kartashov", "Yaroslav V.", "" ], [ "Torner", "Lluis", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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712.318
Halton Arp
H. Arp
Dark Energy and the Hubble Constant
3 Figures, 7 pages
null
null
null
astro-ph
null
Dark energy is inferred from a Hubble expansion which is slower at epochs which are earlier than ours. But evidence reviewed here shows $H_0$ for nearby galaxies is actually less than currently adopted and would instead require {\it deceleration} to reach the current value. Distances of Cepheid variables in galaxies in the Local Supercluster have been measured by the Hubble Space Telescope and it is argued here that they require a low value of $H_0$ along with redshifts which are at least partly intrinsic. The intrinsic component is hypothesized to be a result of the particle masses increasing with time. The same considerations apply to Dark Matter. But with particle masses growing with time, the condensation from plasmoid to proto galaxy not only does away with the need for unseen ``dark matter'' but also explains the intrinsic (non-velocity) redshifts of younger matter.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:10:02 GMT" } ]
2007-12-20T00:00:00
[ [ "Arp", "H.", "" ] ]
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712.3181
Hung The Diep
X. T. Pham Phu (LPTM), V. Thanh Ngo (IOP, Apctp), H. T. Diep (LPTM)
Critical behavior of magnetic thin films as a function of thickness
10 pages, 19 figures
null
null
null
cond-mat.mtrl-sci
null
We study the critical behavior of magnetic thin films as a function of the film thickness. We use the ferromagnetic Ising model with the high-resolution multiple histogram Monte Carlo (MC) simulation. We show that though the 2D behavior remains dominant at small thicknesses, there is a systematic continuous deviation of the critical exponents from their 2D values. We observe that in the same range of varying thickness the deviation of the exponent $\nu$ is rather small, while exponent $\beta$ suffers a larger deviation. We explain these deviations using the concept of "effective" exponents suggested by Capehart and Fisher in a finite-size analysis. The shift of the critical temperature with the film thickness obtained here by MC simulation is in an excellent agreement with their prediction.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:11:22 GMT" } ]
2007-12-20T00:00:00
[ [ "Phu", "X. T. Pham", "", "LPTM" ], [ "Ngo", "V. Thanh", "", "IOP, Apctp" ], [ "Diep", "H. T.", "", "LPTM" ] ]
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712.3182
Ping Dong
Ping Dong, Ming Yang, and Zhuo-Liang Cao
Quantum computation with quantum-dot spin qubits inside a cavity
Four pages and 1 figure
null
null
null
quant-ph
null
Universal set of quantum gates are realized from the conduction-band electron spin qubits of quantum dots embedded in a microcavity via two-channel Raman interaction. All of the gate operations are independent of the cavity mode states, \emph{i.e.}, insensitive to the thermal cavity field. Individual addressing and effective switch of the cavity mediated interaction are directly possible here. Meanwhile, gate operations also can be carried out in parallel. The simple realization of needed interaction for selective qubits makes current scenario more suitable for scalable quantum computation.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:11:54 GMT" } ]
2007-12-20T00:00:00
[ [ "Dong", "Ping", "" ], [ "Yang", "Ming", "" ], [ "Cao", "Zhuo-Liang", "" ] ]
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712.3183
Bruce Yabsley
B.D. Yabsley
Double ccbar production in e+e- annihilations at high energy
5 pages, 5 figures. To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C070805
ECONF C070805:03,2007
null
null
hep-ex hep-ph
null
We review the current state of experimental knowledge on double ccbar production in e+e- annihilation. The large cross-sections (O(20 fb)) for e+e- -> gamma* -> psi(') ccbar_{res} processes have been confirmed by detailed tests and reproduced by a second group: they should now be considered well-established. The latest experimental results concern the case where the second ccbar system is above open-charm threshold: hidden-charm states continue to play a prominent role in the mass spectrum. Some ``loose ends'' in the field are also briefly discussed.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:15:43 GMT" } ]
2011-06-15T00:00:00
[ [ "Yabsley", "B. D.", "" ] ]
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712.3184
Horia Cornean
Philippe Briet, Horia D. Cornean, Delphine Louis
Diamagnetic expansions for perfect quantum gases II: uniform bounds
To appear in Asymptotic Analysis
null
null
null
math-ph cond-mat.mtrl-sci math.MP
null
Consider a charged, perfect quantum gas, in the effective mass approximation, and in the grand-canonical ensemble. We prove in this paper that the generalized magnetic susceptibilities admit the thermodynamic limit for all admissible fugacities, uniformly on compacts included in the analyticity domain of the grand-canonical pressure. The problem and the proof strategy were outlined in \cite{3}. In \cite{4} we proved in detail the pointwise thermodynamic limit near $z=0$. The present paper is the last one of this series, and contains the proof of the uniform bounds on compacts needed in order to apply Vitali's Convergence Theorem.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:20:31 GMT" } ]
2010-06-23T00:00:00
[ [ "Briet", "Philippe", "" ], [ "Cornean", "Horia D.", "" ], [ "Louis", "Delphine", "" ] ]
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712.3185
Thierry Jolicoeur
Brice Chung, Thierry Jolicoeur
Fermions out of Dipolar Bosons in the lowest Landau level
12 pages, 5 figures, published version
Phys. Rev. A77, 043608 (2008)
10.1103/PhysRevA.77.043608
null
cond-mat.mes-hall
null
In the limit of very fast rotation atomic Bose-Einstein condensates may reside entirely in the lowest two-dimensional Landau level (LLL). For small enough filling factor of the LLL, one may have formation of fractional quantum Hall states. We investigate the case of bosons with dipolar interactions as may be realized with Chromium-52 atoms. We show that at filling factor equal to unity the ground state is a Moore-Read (a.k.a Pfaffian) paired state as is the case of bosons with purely s-wave scattering interactions. This Pfaffian state is destabilized when the interaction in the s-wave channel is small enough and the ground state is a stripe phase with unidimensional density modulation. For filling factor 1/3, we show that there is formation of a Fermi sea of ``composite fermions''. These composites are made of one boson bound with three vortices. This phase has a wide range of stability and the effective mass of the fermions depends essentially only of the scattering amplitude in momentum channels larger or equal to 2. The formation of such a Fermi sea opens up a new possible route to detection of the quantum Hall correlations.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:27:57 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 08:29:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Chung", "Brice", "" ], [ "Jolicoeur", "Thierry", "" ] ]
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712.3186
Mihnea Popa
Lawrence Ein and Mihnea Popa
Global division of cohomology classes via injectivity
10 pages; dedication included, and minor corrections made; to appear in the Michigan Math. J. volume in honor of Mel Hochster's 65th birthday
null
null
null
math.AG math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We note that the vanishing and injectivity theorems of Koll\'ar and Esnault-Viehweg can be used to give a quick algebraic proof of a strengthening of the Ein-Lazarsfeld Skoda-type division theorem for global sections of adjoint line bundles vanishing along suitable multiplier ideal sheaves, and to extend it to higher cohomology classes as well. For global sections, this is also a slightly more general statement of the algebraic translation of an analytic result of Siu. Along the way we write down an injectivity statement for multiplier ideals, and its standard consequences.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:21:53 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 18:10:33 GMT" } ]
2008-08-18T00:00:00
[ [ "Ein", "Lawrence", "" ], [ "Popa", "Mihnea", "" ] ]
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712.3187
Florent Chazel
Florent Chazel
On the Korteweg-de Vries approximation for uneven bottoms
null
European Journal of Mechanics / B Fluids 28 (2009), pp. 234-252
10.1016/j.euromechflu.2008.10.003
null
math.AP physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we focus on the water waves problem for uneven bottoms on a two-dimensionnal domain. Starting from the symmetric Boussinesq systems derived in [Chazel, Influence of topography on long water waves, 2007], we recover the uncoupled Korteweg-de Vries (KdV) approximation justified by Schneider and Wayne for flat bottoms, and by Iguchi in the context of bottoms tending to zero at infinity at a substantial rate. The goal of this paper is to investigate the validity of this approximation for more general bathymetries. We exhibit two kinds of topography for which this approximation diverges from the Boussinesq solutions. A topographically modified KdV approximation is then proposed to deal with such bathymetries. Finally, all the models involved are numerically computed and compared.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:51:17 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 15:01:37 GMT" }, { "version": "v3", "created": "Thu, 3 Jan 2008 13:52:18 GMT" }, { "version": "v4", "created": "Fri, 5 Dec 2008 14:59:54 GMT" }, { "version": "v5", "created": "Mon, 2 Feb 2009 13:04:56 GMT" } ]
2009-02-02T00:00:00
[ [ "Chazel", "Florent", "" ] ]
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712.3188
Alexander E. Shalyt-Margolin
A. E. Shalyt-Margolin
Vacuum Energy Problem, Fundamental Length and Deformed Quantum Field Theory
12 pages
null
null
null
gr-qc
null
The cosmological constant (vacuum energy) problem is analyzed within the scope of quantum theories with UV-cut-off or fundamental length. Various cases associated with the appearance of the latter are considered both using the Generalized Uncertainty Relations and the deformed density matrix,previously introduced in the author's works. The use of the deformed density matrix is examined in detail. It is demonstrated that, provided the Fischler-Susskind cosmic holographic conjecture is valid, the Vacuum Energy Density takes a value close to the experimental one. The arguments supporting the validity of this conjecture are given on the basis of the recently obtained results on Gravitational Holography.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:53:03 GMT" } ]
2007-12-20T00:00:00
[ [ "Shalyt-Margolin", "A. E.", "" ] ]
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712.3189
S. B. Rutkevich
S. B. Rutkevich
Energy spectrum of bound-spinons in the quantum Ising spin-chain ferromagnet
33 pages, 8 figures
J. Stat. Phys., Vol. 131, N5, 917-939 (2008)
10.1007/s10955-008-9495-1
null
cond-mat.stat-mech
null
We study the excitation energy spectrum in the S=1/2 ferromagnetic Ising spin chain with the easy axis z in a magnetic field h={h_x,0,h_z}. According to Wu and McCoy's scenario of weak confinement, the fermionic spinon excitations (kinks), being free at h_z = 0 in the ordered phase, are coupled into bosonic bound states at arbitrary small h_z. We calculate the energy spectrum of such excitations in the leading order in small h_z, using different perturbative methods developed for the similar problem in the Ising field theory.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:24:05 GMT" } ]
2008-05-05T00:00:00
[ [ "Rutkevich", "S. B.", "" ] ]
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712.319
Helmut Dannerbauer
H. Dannerbauer, F. Walter, G. Morrison
Interferometric detections of GOODS 850-5 at 1 mm and 1.4 GHz
Accepted for publication by ApJL (12 pages, 1 figure). The resolution of figure 1 has been degraded. A higher quality pdf version of this paper is available at http://www.mpia-hd.mpg.de/homes/dannerb/
null
10.1086/528794
null
astro-ph
null
We have obtained a position (at sub-arcsecond accuracy) of the submillimeter bright source GOODS 850-5 (also known as GN10) in the GOODS North field using the IRAM Plateau de Bure interferometer at 1.25 mm wavelengths (MM J123633+6214.1, flux density: S(1.25 mm)=5.0+-1.0 mJy). This source has no optical counterpart in deep ACS imaging down to a limiting magnitude of i(775)=28.4 mag and its position is coincident with the position found in recent sub-millimeter mapping obtained at the SMA (Wang et al. 2007). Using deep VLA imaging at 20 cm, we find a radio source (S(20 cm)=32.7+-4.3 microJy) at the same position that is significantly brighter than reported in Wang et al. The source is detected by Spitzer in IRAC as well as at 24 microns. We apply different photometric redshift estimators using measurements of the dusty, mid/far-infrared part of the SED and derive a redshift z~4. Given our detection in the millimeter and radio we consider a significantly higher redshift (e.g., z~6 Wang et al. 2007) unlikely. MM J123633+6214.1 alias GOODS 850-5 nevertheless constitutes a bright representative of the high-redshift tail of the submillimeter galaxy population that may contribute a significant fraction to the (sub)millimeter background.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:07:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Dannerbauer", "H.", "" ], [ "Walter", "F.", "" ], [ "Morrison", "G.", "" ] ]
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712.3191
Lucia Cavallasca
Roberto Artuso, Lucia Cavallasca, Giampaolo Cristadoro
Intermittency in two dimensions
9 pages, 11 figures
null
null
null
nlin.CD
null
We introduce a family of area-preserving maps representing a (non-trivial) two-dimensional extension of the Pomeau-Manneville family in one dimension. We analyze the long-time behavior of recurrence time distributions and correlations, providing analytical and numerical estimates. We study the transport properties of a suitable lift and use a probabilistic argument to derive the full spectrum of transport moments. Finally the dynamical effects of a stochastic perturbation are considered.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 13:59:46 GMT" } ]
2007-12-20T00:00:00
[ [ "Artuso", "Roberto", "" ], [ "Cavallasca", "Lucia", "" ], [ "Cristadoro", "Giampaolo", "" ] ]
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712.3192
Mihnea Popa
Mihnea Popa
Generalized theta linear series on moduli spaces of vector bundles on curves
33 pages; made a few minor corrections and improvements, and added some new results in the last section; written for the Handbook of Moduli
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article is based on lecture notes prepared for the August 2006 Cologne Summer School. The first part contains background material and references for beginners. The second (and main) part is a survey of the current status in the theory of pluri-theta linear series and generalized theta divisors on moduli spaces of vector bundles on curves. It emphasizes relatively new techniques employed in the analysis of linear series on these moduli spaces, namely the use of moduli spaces of stable maps for understanding Quot schemes, and the Fourier-Mukai functor in the study of coherent sheaves on abelian varieties. In addition, it briefly describes recent important developments, most significant of which is the proof of the Strange Duality conjecture due to Belkale and Marian-Oprea.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:00:11 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 18:03:21 GMT" }, { "version": "v3", "created": "Thu, 7 Feb 2008 16:31:09 GMT" }, { "version": "v4", "created": "Sun, 17 Jan 2010 23:31:46 GMT" } ]
2010-01-18T00:00:00
[ [ "Popa", "Mihnea", "" ] ]
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712.3193
Ivanov Dmitry
D.Yu. Ivanov
Exclusive vector meson electroproduction
7 pages; Talk given at 12th International Conference on Elastic and Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany, 21-25 May 2007
null
null
null
hep-ph
null
We discuss exclusive vector meson electroproduction within the QCD collinear factorization framework. In Bjorken kinematics the amplitude factorizes in a convolution of the nonperturbative meson distribution amplitude and the generalized parton densities with the perturbatively calculable hard-scattering amplitudes, which are presently known to next-to-leading order (NLO). At small $x_{\rm B}$ NLO corrections are very large. It is related to appearance of BFKL type logarithms in the hard-scattering amplitudes, that calls for a resummation of these effects at higher orders. Here we report the first results of such resummation.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:29:32 GMT" } ]
2007-12-20T00:00:00
[ [ "Ivanov", "D. Yu.", "" ] ]
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712.3194
Harold Steinacker
Harold Steinacker
Emergent 4D Gravity from Matrix Models
5 pages. Based on talks given at the BW2007 workshop "Challenges Beyond the Standard Model", Kladovo, Serbia and the Vienna Central European Seminar "Particle Physics and quantum field theory" 2007 and the workshop "Field Theory, Non-commutative Geometry and Strings", Zagreb, Croatia: November 9-11, 2007
Fortsch.Phys.56:510-515,2008
10.1002/prop.200710527
null
hep-th
null
Recent progress in the understanding of gravity on noncommutative spaces is discussed. A gravity theory naturally emerges from matrix models of noncommutative gauge theory. The effective metric depends on the dynamical Poisson structure, absorbing the degrees of freedom of the would-be U(1) gauge field. The gravity action is induced upon quantization.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:10:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Steinacker", "Harold", "" ] ]
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712.3195
Pierre Jop
Pierre Jop (LPMCN, Iusti)
Hydrodynamic modeling of granular flows in a modified Couette cell
4 pages
null
10.1103/PhysRevE.77.032301
null
cond-mat.soft
null
We present simulations of granular flows in a modified Couette cell, using a continuum model recently proposed for dense granular flows. Based on a friction coefficient, which depends on an inertial number, the model captures the positions of the wide shear bands. We show that a smooth transition in velocity-profile shape occurs when increasing the height of the granular material, leading to a differential rotation of the central part close to the surface. The numerical predictions are in qualitative agreement with previous experimental results. The model provides predictions for the increase of the shear bands width when increasing the rotation rate.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:12:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Jop", "Pierre", "", "LPMCN, Iusti" ] ]
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712.3196
Daniel Garcia-Sanchez
D. Garcia-Sanchez, A. San Paulo, M.J. Esplandiu, F. Perez-Murano, L. Forro, A. Aguasca, A. Bachtold
Mechanical detection of carbon nanotube resonator vibrations
null
Published in Phys. Rev. Lett. 99, 085501 (2007)
10.1103/PhysRevLett.99.085501
null
cond-mat.mes-hall
null
Bending-mode vibrations of carbon nanotube resonator devices were mechanically detected in air at atmospheric pressure by means of a novel scanning force microscopy method. The fundamental and higher order bending eigenmodes were imaged at up to 3.1GHz with sub-nanometer resolution in vibration amplitude. The resonance frequency and the eigenmode shape of multi-wall nanotubes are consistent with the elastic beam theory for a doubly clamped beam. For single-wall nanotubes, however, resonance frequencies are significantly shifted, which is attributed to fabrication generating, for example, slack. The effect of slack is studied by pulling down the tube with the tip, which drastically reduces the resonance frequency.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:13:22 GMT" } ]
2012-07-12T00:00:00
[ [ "Garcia-Sanchez", "D.", "" ], [ "Paulo", "A. San", "" ], [ "Esplandiu", "M. J.", "" ], [ "Perez-Murano", "F.", "" ], [ "Forro", "L.", "" ], [ "Aguasca", "A.", "" ], [ "Bachtold", "A.", "" ] ]
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712.3197
Li Yang
Li Yang and Yufu Chen
An Upper Bound to the Number of Gates on Single Qubit within One Error-Correction Period of Quantum Computation
null
null
null
null
quant-ph
null
Based on the amplitude behavior of quantum Rabi oscillation driven by a coherent field we show that there exists an upper bound to the number of logical operation performed on any single qubit within one error-correction period of a quantum computation. We introduce a parameter to depict the maximum of this number and estimate its decoherence limit. The analysis shows that a generally accepted error-rate threshold of quantum logic gates limits the parameter to so small a number that even a double of fault-tolerant Toffoli gates can hardly be implemented reliably within one error-correction period. This result suggests that the design of feasible fault-tolerant quantum circuits is still an arduous task.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:20:12 GMT" }, { "version": "v2", "created": "Wed, 26 Dec 2007 10:10:53 GMT" } ]
2007-12-26T00:00:00
[ [ "Yang", "Li", "" ], [ "Chen", "Yufu", "" ] ]
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712.3198
Ivan Struchiner
Rui Loja Fernandes and Ivan Struchiner
Lie Algebroids and Classification Problems in Geometry
16 pages; research announcement; final version to appear in Sao Paulo Journal of Mathematical Sciences
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show how one can associate to a given class of finite type G-structures a classifying Lie algebroid. The corresponding Lie groupoid gives models for the different geometries that one can find in the class, and encodes also the different types of symmetry groups.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:20:03 GMT" }, { "version": "v2", "created": "Fri, 25 Jul 2008 12:03:56 GMT" } ]
2008-07-25T00:00:00
[ [ "Fernandes", "Rui Loja", "" ], [ "Struchiner", "Ivan", "" ] ]
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712.3199
Manuel Tessmer
M. Tessmer and A. Gopakumar
Gravitational waves from compact binaries inspiralling along post-Newtonian accurate eccentric orbits: Data analysis implications
12 pages, 3 figures, submitted to Phys. Rev. D
Phys.Rev.D78:084029,2008
10.1103/PhysRevD.78.084029
null
gr-qc
null
Compact binaries inspiralling along eccentric orbits are plausible gravitational wave (GW) sources for the ground-based laser interferometers. We explore the losses in the event rates incurred when searching for GWs from compact binaries inspiralling along post-Newtonian accurate eccentric orbits with certain obvious non-optimal search templates. For the present analysis, GW signals having 2.5 post-Newtonian accurate orbital evolution are modeled following the phasing formalism, presented in [T. Damour, A. Gopakumar, and B. R. Iyer, Phys. Rev. D \textbf{70}, 064028 (2004)]. We demonstrate that the search templates that model in a gauge-invariant manner GWs from compact binaries inspiralling under qudrupolar radiation reaction along 2PN accurate circular orbits are very efficient in capturing our somewhat realistic GW signals. However, three types of search templates based on the adiabatic, complete adiabatic and gauge-dependent complete non-adiabatic approximants, detailed in [P. Ajith, B. R. Iyer, C. A. K. Robinson and B. S. Sathyaprakash, %``A new class of post-Newtonian approximants to the dynamics of inspiralling %compact binaries: Test-mass in the Schwarzschild spacetime,'' Phys. Rev. D {\bf 71}, 044029 (2005)], relevant for the circular inspiral under the qudrupolar radiation reaction were found to be inefficient in capturing the above mentioned eccentric signal. We conclude that further investigations will be required to probe the ability of various types of PN accurate circular templates, employed to analyze the LIGO/VIRGO data, to capture GWs from compact binaries having tiny orbital eccentricities.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:21:08 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 12:27:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Tessmer", "M.", "" ], [ "Gopakumar", "A.", "" ] ]
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712.32
Laurene Jouve
L. Jouve and A.S. Brun (Laboratoire AIM, CEA/DSM-CNRS-Universit\'e Paris Diderot, DAPNIA/SAp, France)
On the role of meridional flows in flux transport dynamo models
12 pages, 10 ps figures
Astron.Astrophys.474:239-250,2007
10.1051/0004-6361:20077070
null
astro-ph
null
The Sun is a magnetic star whose magnetism and cyclic activity is linked to the existence of an internal dynamo. We aim to understand the establishment of the solar magnetic 22-yr cycle, its associated butterfly diagram and field parity selection through numerical simulations of the solar global dynamo. Inspired by recent observations and 3D simulations that both exhibit multicellular flows in the solar convection zone, we seek to characterise the influence of various profiles of circulation on the behaviour of solar mean-field dynamo models. We are using 2-D mean field flux transport Babcock-Leighton numerical models in which we test several types of meridional flows: 1 large single cell, 2 cells in radius and 4 cells per hemisphere. We confirm that adding cells in latitude tends to speed up the dynamo cycle whereas adding cells in radius more than triples the period. We find that the cycle period in the four cells model is less sensitive to the flow speed than in the other simpler meridional circulation profiles studied. Moreover, our studies show that adding cells in radius or in latitude seems to favour the parity switching to a quadrupolar solution. According to our numerical models, the observed 22-yr cycle and dipolar parity is easily reproduced by models including multicellular meridional flows. On the contrary, the resulting butterfly diagram and phase relationship between the toroidal and poloidal fields are affected to a point where it is unlikely that such multicellular meridional flows persist for a long period of time inside the Sun, without having to reconsider the model itself.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:32:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Jouve", "L.", "", "Laboratoire AIM, CEA/DSM-CNRS-Université\n Paris Diderot, DAPNIA/SAp, France" ], [ "Brun", "A. S.", "", "Laboratoire AIM, CEA/DSM-CNRS-Université\n Paris Diderot, DAPNIA/SAp, France" ] ]
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712.3201
Pietro Falgari
P. Falgari
Four-fermion production near the W-pair production threshold
To appear in the proceedings of the 8th International Symposium on Radiative Corrections, October 1-5, 2007, Florence, Italy
PoSRADCOR2007:003,2007
null
PITHA 07/22, SFB/CPP-07-91
hep-ph
null
I report on recent results for the total production cross section of the process e- e+ -> mu- nubar_mu u dbar X near the W-pair production threshold up to next-to-leading order in GammaW/MW alpha v^2 obtained in the framework of unstable-particle effective field theory. Remaining theoretical uncertainties and their impact on the experimental determination of the W mass are discussed.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:35:27 GMT" } ]
2009-04-14T00:00:00
[ [ "Falgari", "P.", "" ] ]
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712.3202
Megumi Harada
Megumi Harada, Paul Selick
Kirwan surjectivity in K-theory for Hamiltonian loop group quotients
18 pages
null
null
null
math.SG math.AT
null
Let G be a compact Lie group and LG its associated loop group. The main result of this manuscript is a surjectivity theorem from the equivariant K-theory of a Hamiltonian LG-space onto the integral K-theory of its Hamiltonian LG-quotient. Our result is a K-theoretic analogue of previous work in rational Borel-equivariant cohomology of Bott, Tolman, and Weitsman. Our proof techniques differ from that of Bott, Tolman, and Weitsman in that they explicitly use the Borel construction, which we do not have at our disposal in equivariant K-theory; we instead directly construct G-equivariant homotopy equivalences to obtain the necessary isomorphisms in equivariant K-theory. The main theorem should also be viewed as a first step toward a similar theorem in K-theory for quasi-Hamiltonian G-spaces and their associated quasi-Hamiltonian quotients.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:43:15 GMT" } ]
2007-12-20T00:00:00
[ [ "Harada", "Megumi", "" ], [ "Selick", "Paul", "" ] ]
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712.3203
Wan ChangLin
Changlin Wan, Zhongzhi Shi
Solving Medium-Density Subset Sum Problems in Expected Polynomial Time: An Enumeration Approach
11 pages, 1 figure
Changlin Wan, Zhongzhi Shi: Solving Medium-Density Subset Sum Problems in Expected Polynomial Time: An Enumeration Approach. FAW 2008: 300-310
10.1007/978-3-540-69311-6_31
null
cs.DS cs.CC cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The subset sum problem (SSP) can be briefly stated as: given a target integer $E$ and a set $A$ containing $n$ positive integer $a_j$, find a subset of $A$ summing to $E$. The \textit{density} $d$ of an SSP instance is defined by the ratio of $n$ to $m$, where $m$ is the logarithm of the largest integer within $A$. Based on the structural and statistical properties of subset sums, we present an improved enumeration scheme for SSP, and implement it as a complete and exact algorithm (EnumPlus). The algorithm always equivalently reduces an instance to be low-density, and then solve it by enumeration. Through this approach, we show the possibility to design a sole algorithm that can efficiently solve arbitrary density instance in a uniform way. Furthermore, our algorithm has considerable performance advantage over previous algorithms. Firstly, it extends the density scope, in which SSP can be solved in expected polynomial time. Specifically, It solves SSP in expected $O(n\log{n})$ time when density $d \geq c\cdot \sqrt{n}/\log{n}$, while the previously best density scope is $d \geq c\cdot n/(\log{n})^{2}$. In addition, the overall expected time and space requirement in the average case are proven to be $O(n^5\log n)$ and $O(n^5)$ respectively. Secondly, in the worst case, it slightly improves the previously best time complexity of exact algorithms for SSP. Specifically, the worst-case time complexity of our algorithm is proved to be $O((n-6)2^{n/2}+n)$, while the previously best result is $O(n2^{n/2})$.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:43:50 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 02:00:12 GMT" } ]
2008-06-23T00:00:00
[ [ "Wan", "Changlin", "" ], [ "Shi", "Zhongzhi", "" ] ]
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712.3204
Francesco Giazotto
N. B. Kopnin, F. Taddei, J. P. Pekola, and F. Giazotto
Influence of photon-assisted tunneling on heat flow in a normal metal - superconductor tunnel junction
10 pages, 8 colour figures, published version
Phys. Rev. B 77, 104517 (2008)
10.1103/PhysRevB.77.104517
null
cond-mat.mes-hall cond-mat.supr-con
null
We have investigated theoretically the influence of an AC drive on heat transport in a hybrid normal metal - superconductor tunnel junction in the photon-assisted tunneling regime. We find that the useful heat flux out from the normal metal is always reduced as compared to its magnitude under the static and quasi-static drive conditions. Our results are useful to predict the operative conditions of AC driven superconducting electron refrigerators.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:15:53 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 13:06:31 GMT" } ]
2008-03-21T00:00:00
[ [ "Kopnin", "N. B.", "" ], [ "Taddei", "F.", "" ], [ "Pekola", "J. P.", "" ], [ "Giazotto", "F.", "" ] ]
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712.3205
Ilia Zharkov
Ilia Zharkov
Tropical theta characteristics
4 pages, still an addendum to math.AG/0612267v2, exposition improved, description of positive theta added
null
null
null
math.AG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This note is a follow up of math.AG/0612267v2 and it is largely inspired by a beautiful description of Baker-Norine of non-effective degree (g-1) divisors via chip-firing game. We consider the set of all theta characteristics on a tropical curve and identify the Riemann constant as a unique non-effective one among them.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 14:47:48 GMT" }, { "version": "v2", "created": "Wed, 18 Feb 2009 22:33:45 GMT" } ]
2009-02-19T00:00:00
[ [ "Zharkov", "Ilia", "" ] ]
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712.3206
Ram Brustein
Ram Brustein, Dan Gorbonos, Merav Hadad
Wald's entropy is equal to a quarter of the horizon area in units of the effective gravitational coupling
20 pages ; added clarifications, explanations, new section on the choice of polarizations, results unchanged; replaced with published version
Phys.Rev.D79:044025,2009
10.1103/PhysRevD.79.044025
null
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Bekenstein-Hawking entropy of black holes in Einstein's theory of gravity is equal to a quarter of the horizon area in units of Newton's constant. Wald has proposed that in general theories of gravity the entropy of stationary black holes with bifurcate Killing horizons is a Noether charge which is in general different from the Bekenstein-Hawking entropy. We show that the Noether charge entropy is equal to a quarter of the horizon area in units of the effective gravitational coupling on the horizon defined by the coefficient of the kinetic term of specific graviton polarizations on the horizon. We present several explicit examples of static spherically symmetric black holes.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:13:40 GMT" }, { "version": "v2", "created": "Wed, 12 Nov 2008 14:04:59 GMT" }, { "version": "v3", "created": "Mon, 2 Mar 2009 12:04:01 GMT" } ]
2014-11-18T00:00:00
[ [ "Brustein", "Ram", "" ], [ "Gorbonos", "Dan", "" ], [ "Hadad", "Merav", "" ] ]
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712.3207
Monica Orienti
M. Orienti (1,2,3), D. Dallacasa (2,3),((1) IAC, (2) Dipartimento di Astronomia, Bologna, (3) IRA-INAF, Bologna)
Constraining the nature of High Frequency Peakers. II. Polarization properties
9 pages, 2 figures; accepted for publication in A&A
null
10.1051/0004-6361:20078572
null
astro-ph
null
Aims: The ``bright'' High Frequency Peakers (HFPs) sample is a mixture of blazars and intrinsically small and young radio sources. We investigate the polarimetric characteristics of 45 High Frequency Peakers, from the ``bright'' HFP sample, in order to have a deeper knowledge of the nature of each object, and to construct a sample made of genuine young radio sources only. Methods: Simultaneous VLA observations carried out at 22.2, 15.3, 8.4 and 5.0 GHz, together with the information at 1.4 GHz provided by the NVSS at an earlier epoch, have been used to study the linearly polarized emission. Results: From the analysis of the polarimetric properties of the 45 sources we find that 26 (58%) are polarized at least at one frequency, while 17 (38%) are completely unpolarized at all frequencies. We find a correlation between fractional polarization and the total intensity variability. We confirm that there is a clear distinction between the polarization properties of galaxies and quasars: 17 (66%) quasars are highly polarized, while all the 9 galaxies are either unpolarized (<0.2%) or marginally polarized with fractional polarization below 1%. This suggests that most HFP candidates identified with quasars are likely to represent a radio source population different from young radio objects.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:14:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Orienti", "M.", "" ], [ "Dallacasa", "D.", "" ] ]
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712.3208
Una Hwang
Una Hwang, Robert Petre, Kathryn A. Flanagan
X-ray Emitting Ejecta in Puppis A Observed with Suzaku
25 pages latex, 6 postscript figures; ApJ, in press
null
10.1086/528925
null
astro-ph
null
We report the detection and localization of X-ray emitting ejecta in the middle-aged Galactic supernova remnant Puppis A using five observations with the Suzaku X-ray Imaging Spectrometer to survey the eastern and middle portions of the remnant. A roughly 3' by 5', double-peaked region in the north center is found to be highly enriched in Si and other elements relative to the rest of the remnant. The X-ray fitted abundances are otherwise well below the solar values. While the ejecta-enhanced regions show some variation of relative element abundances, there is little evidence for a very strong enhancement of one element over the others in the imaged portion of the remnant, except possibly for a region of O and Ne enhancement in the remnant's south center. There is no spatial correlation between the compact [O III] emitting ejecta knots seen optically and the abundance enhancements seen in X-rays, although they are located in the same vicinity. The map of fitted column density shows strong variations across the remnant that echo earlier X-ray spectral hardness maps. The ionization age (as fitted for single temperature models) is sharply higher in a ridge behind the northeast-east boundary of the remnant, and is probably related to the strong molecular cloud interaction along that boundary. The temperature map, by comparison, shows relatively weak variations.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:21:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Hwang", "Una", "" ], [ "Petre", "Robert", "" ], [ "Flanagan", "Kathryn A.", "" ] ]
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712.3209
Hans-Joachim Drescher
H.J. Drescher (Frankfurt Institute for Advanced Studies), M. Strikman (Pennsylvania State University)
Toward an effective centrality trigger in pp collisions at LHC
4 pages, 6 figures
null
null
null
hep-ph
null
We investigate the impact of very strong small x gluon fields in colliding nucleons at LHC energies on the interaction of valence quarks. We find that in the range of small impact parameters, which contribute significantly to the production of heavy new particles, several of the valence quarks receive large transverse momenta, exceeding 1 GeV/c. This results in a suppression of leading baryon production and consequently in an additional energy flow to smaller rapidities. We suggest several triggers for centrality in pp collisions which allow one to study the propagation of partons through gluon fields of a strength comparable to the ones encountered in heavy ion collisions at the LHC.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:27:09 GMT" } ]
2007-12-20T00:00:00
[ [ "Drescher", "H. J.", "", "Frankfurt Institute for Advanced Studies" ], [ "Strikman", "M.", "", "Pennsylvania State University" ] ]
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712.321
Matthieu Marouby
Matthieu Marouby
Simulation of a Local Time Fractional Stable Motion
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we simulate sample paths of a class of symmetric $\alpha$-stable processes using their series expression. We will develop a result in the approximation of shot-noise series. And finally, we will get a convergence rate for the approximation.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:28:55 GMT" }, { "version": "v2", "created": "Wed, 16 Jul 2008 11:33:40 GMT" } ]
2008-07-16T00:00:00
[ [ "Marouby", "Matthieu", "" ] ]
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712.3211
Kirill Alekseev
Timo Hyart, Kirill N. Alekseev, and Erkki V. Thuneberg
Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains
13 pages, 12 figures
null
10.1103/PhysRevB.77.165330
null
cond-mat.mes-hall cond-mat.stat-mech
null
We study theoretically the feasibility of amplification and generation of terahertz radiation in dc-ac-driven semiconductor superlattices in the absence of electric domains. We find that if in addition to dc bias a strong THz pump field is applied, Bloch gain profile for a small THz signal can be achieved under conditions of positive static differential conductivity. Here the positive differential conductivity arises, similarly to the case of large-signal amplification scheme [H. Kroemer, cond-mat/0009311)], due to modifications of dc current density caused by the application of high-frequency ac field [K. Unterrainer \textit{et al.}, Phys. Rev. Lett. \textbf{76}, 2973 (1996)]. Whereas the sign of absorption at low and zero frequencies is sensitive to the ac fields, the gain profile in the vicinity of gain maximum is robust. We suggest to use this ac-induced effect in a starter for THz Bloch oscillator. Our analysis demonstrates that the application of a short THz pulse to a superlattice allows to suppress the undesirable formation of electric domains and reach a sustained large-amplitude operation of the dc-biased Bloch scillator.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:37:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Hyart", "Timo", "" ], [ "Alekseev", "Kirill N.", "" ], [ "Thuneberg", "Erkki V.", "" ] ]
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712.3212
Marten van Kerkwijk
M. H. van Kerkwijk (Toronto) and D. L. Kaplan (MIT)
Timing the Nearby Isolated Neutron Star RX J1856.5-3754
4 pages, 2 figures, 2 tables; accepted for publication in Astrophysical Journal (Letters)
Astrophys.J.673:L163-L166, 2008
10.1086/528796
null
astro-ph
null
RX J1856.5-3754 is the X-ray brightest among the nearby isolated neutron stars. Its X-ray spectrum is thermal, and is reproduced remarkably well by a black-body, but its interpretation has remained puzzling. One reason is that the source did not exhibit pulsations, and hence a magnetic field strength--vital input to atmosphere models--could not be estimated. Recently, however, very weak pulsations were discovered. Here, we analyze these in detail, using all available data from the XMM-Newton and Chandra X-ray observatories. From frequency measurements, we set a 2-sigma upper limit to the frequency derivative of \dot\nu<1.3e-14 Hz/s. Trying possible phase-connected timing solutions, we find that one solution is far more likely than the others, and we infer a most probable value of \dot\nu=(-5.98+/-0.14)e-16 Hz/s. The inferred magnetic field strength is 1.5e13 G, comparable to what was found for similar neutron stars. From models, the field seems too strong to be consistent with the absence of spectral features for non-condensed atmospheres. It is sufficiently strong, however, that the surface could be condensed, but only if it is consists of heavy elements like iron. Our measurements imply a characteristic age of about 4 Myr. This is longer than the cooling and kinematic ages, as was found for similar objects, but at almost a factor ten, the discrepancy is more extreme. A puzzle raised by our measurement is that the implied rotational energy loss rate of about 3e30 erg/s is orders of magnitude smaller than what was inferred from the H-alpha nebula surrounding the source.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:57:05 GMT" } ]
2010-04-30T00:00:00
[ [ "van Kerkwijk", "M. H.", "", "Toronto" ], [ "Kaplan", "D. L.", "", "MIT" ] ]
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712.3213
John Irving
J. Irving and A. Rattan
The number of lattice paths below a cyclically shifting boundary
20 pages, 13 figures
null
null
null
math.CO
null
We count the number of lattice paths lying under a cyclically shifting piecewise linear boundary of varying slope. Our main result extends well known enumerative formulae concerning lattice paths, and its derivation involves a classical reflection argument. A refinement allows for the counting of paths with a specified number of corners. We also apply the result to examine paths dominated by periodic boundaries.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:48:31 GMT" } ]
2007-12-20T00:00:00
[ [ "Irving", "J.", "" ], [ "Rattan", "A.", "" ] ]
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712.3214
Mahir S. Hussein
M. S. Hussein, J. X. de Carvalho, M. P. Pato and A. J. Sargeant
Symmetry Breaking Study with Random Matrix Ensembles
12 pages, 3 figures Contribution to the International Workshop on Nuclei and Mesoscopic Physics (WNM07), 20-22 October, Michigan Sate University, East Lansing, Michigan. To appear in a AIP Proceeding (Pawel Danielewicz, Editor)
null
10.1063/1.2915605
null
physics.data-an
null
A random matrix model to describe the coupling of $m$-fold symmetry is constructed. The particular threefold case is used to analyze data on eigenfrequencies of elastomechanical vibration of an anisotropic quartz block. It is suggested that such experimental/theoretical study may supply a powerful means to discern intrinsic symmetry of physical systems.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:49:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Hussein", "M. S.", "" ], [ "de Carvalho", "J. X.", "" ], [ "Pato", "M. P.", "" ], [ "Sargeant", "A. J.", "" ] ]
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712.3215
Francoise Sandoz-Guermond
Fran\c{c}oise Sandoz-Guermond (LIESP), Marc-Eric Bobiller-Chaumon (GRePS)
L'accessibilit\'e des E-services aux personnes non-voyantes : difficult\'es d'usage et recommandations
4 pages
Dans International Conference Proceedings of IHM'2006 - IIHM : Interaction Homme Machine, Montr\'eal : Canada (2006)
null
null
cs.HC
null
While taking into account handicapped people in the design of technologies represents a social and political stake that becomes important (in particular with the recent law on equal rights for all the citizens, March 2004), this paper aims at evaluating the level of accessibility of two sites of E-services thanks to tests of use and proposing a set of recommendations in order to increase usability for the largest amount of people.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:54:07 GMT" } ]
2007-12-20T00:00:00
[ [ "Sandoz-Guermond", "Françoise", "", "LIESP" ], [ "Bobiller-Chaumon", "Marc-Eric", "", "GRePS" ] ]
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712.3216
Benjamin Lungwitz
The NA49 Collaboration: B. Lungwitz, et al
Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at the CERN SPS
26 pages, 34 figures, updated version including referee comments
null
10.1103/PhysRevC.78.034914
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multiplicity fluctuations of positively, negatively and all charged hadrons in the forward hemisphere were studied in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV. The multiplicity distributions and their scaled variances are presented in dependence of collision energy as well as of rapidity and transverse momentum. The distributions have bell-like shape and their scaled variances are in the range from 0.8 to 1.2 without any significant structure in their energy dependence. No indication of the critical point in fluctuations are observed. The string-hadronic model UrQMD significantly overpredicts the mean, but approximately reproduces the scaled variance of the multiplicity distributions. The predictions of the statistical hadron-resonance gas model obtained within the grand-canonical and canonical ensembles disagree with the measured scaled variances. The narrower than Poissonian multiplicity fluctuations measured in numerous cases may be explained by the impact of conservation laws on fluctuations in relativistic systems.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:02:17 GMT" }, { "version": "v2", "created": "Wed, 30 Jul 2008 14:14:36 GMT" }, { "version": "v3", "created": "Sat, 9 Aug 2008 09:54:17 GMT" } ]
2013-05-29T00:00:00
[ [ "The NA49 Collaboration", "", "" ], [ "Lungwitz", "B.", "" ] ]
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712.3217
Francois Delarue
Francois Delarue (PMA), Fr\'ed\'eric Lagouti\`ere (LJLL)
Probabilistic analysis of the upwind scheme for transport
null
Archive for Rational Mechanics and Analysis (2011) 229--268
10.1007/s00205-010-0322-x
null
math.NA math.PR
null
We provide a probabilistic analysis of the upwind scheme for multi-dimensional transport equations. We associate a Markov chain with the numerical scheme and then obtain a backward representation formula of Kolmogorov type for the numerical solution. We then understand that the error induced by the scheme is governed by the fluctuations of the Markov chain around the characteristics of the flow. We show, in various situations, that the fluctuations are of diffusive type. As a by-product, we prove that the scheme is of order 1/2 for an initial datum in BV and of order 1/2-a, for all a>0, for a Lipschitz continuous initial datum. Our analysis provides a new interpretation of the numerical diffusion phenomenon.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:55:54 GMT" } ]
2015-05-13T00:00:00
[ [ "Delarue", "Francois", "", "PMA" ], [ "Lagoutière", "Frédéric", "", "LJLL" ] ]
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712.3218
Matteo Luca Ruggiero
Matteo Luca Ruggiero
Gravitational Lensing and f(R) theories in the Palatini approach
7 Pages, RevTex, 1 eps figure; references added; revised to match the version accepted for publication in General Relativity and Gravitation
Gen.Rel.Grav.41:1497-1509,2009
10.1007/S1071400807172 10.1007/s10714-008-0717-2
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate gravitational lensing in the Palatini approach to the f(R) extended theories of gravity. Starting from an exact solution of the f(R) field equations, which corresponds to the Schwarzschild-de Sitter metric and, on the basis of recent studies on this metric, we focus on some lensing observables, in order to evaluate the effects of the non linearity of the gravity Lagrangian. We give estimates for some astrophysical events, and show that these effects are tiny for galactic lenses, but become interesting for extragalactic ones.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 15:57:55 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 16:26:42 GMT" }, { "version": "v3", "created": "Mon, 3 Nov 2008 16:32:04 GMT" } ]
2009-07-22T00:00:00
[ [ "Ruggiero", "Matteo Luca", "" ] ]
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712.3219
Manfred Cuntz
W. von Bloh, C. Bounama, M. Cuntz, S. Franck
Habitability of Super-Earths: Gliese 581c and 581d
3 pages, 1 figure; submitted to: Exoplanets: Detection, Formation and Dynamics, IAU Symposium 249, eds. Y.-S. Sun, S. Ferraz-Mello, and J.-L. Zhou (Cambridge: Cambridge University Press)
null
10.1017/S1743921308017031
null
astro-ph
null
The unexpected diversity of exoplanets includes a growing number of super-Earth planets, i.e., exoplanets with masses smaller than 10 Earth masses. Unlike the larger exoplanets previously found, these smaller planets are more likely to have a similar chemical and mineralogical composition to the Earth. We present a thermal evolution model for super-Earth planets to identify the sources and sinks of atmospheric carbon dioxide. The photosynthesis-sustaining habitable zone (pHZ) is determined by the limits of biological productivity on the planetary surface. We apply our model to calculate the habitability of the two super-Earths in the Gliese 581 system. The super-Earth Gl 581c is clearly outside the pHZ, while Gl 581d is at the outer edge of the pHZ. Therefore it could at least harbor some primitive forms of life.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:14:26 GMT" }, { "version": "v2", "created": "Mon, 24 Dec 2007 20:05:08 GMT" }, { "version": "v3", "created": "Fri, 15 Feb 2008 21:26:52 GMT" }, { "version": "v4", "created": "Tue, 19 Feb 2008 22:16:26 GMT" } ]
2009-11-13T00:00:00
[ [ "von Bloh", "W.", "" ], [ "Bounama", "C.", "" ], [ "Cuntz", "M.", "" ], [ "Franck", "S.", "" ] ]
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712.322
Viviana Sica
Michael Gurstein
What is Community Informatics (and Why Does It Matter)?
109 pages, ISBN 978-88-7699-097-7 (Printed edition), ISBN 978-88-7699-098-4 (Electronic edition), printed edition available at http://www.amazon.com and on http://www.lulu.com
"Publishing studies" book series, edited by Giandomenico Sica, ISSN 1973-6061 (Printed edition), ISSN 1973-6053 (Electronic edition)
null
null
cs.CY
null
Community Informatics (CI) is the application of information and communications technologies (ICTs) to enable community processes and the achievement of community objectives. CI goes beyond the "Digital Divide" to making ICT access usable and useful to excluded populations and communities for local economic development, social justice, and political empowerment. CI approaches ICTs from a "community" perspective and develops strategies and techniques for managing their use by communities both virtual and physical including the variety of Community Networking applications. CI assumes that both communities have characteristics, requirements, and opportunities that require different strategies for ICT intervention and development from individual access and use. Also, CI addresses ICT use in Developing Countries as well as among the poor, the marginalized, the elderly, or those living in remote locations in Developed Countries. CI is of interest both to ICT practitioners and academic researchers and addresses the connections between the policy and pragmatic issues arising from the tens of thousands of Community Networks, Community Technology Centres, Telecentres, Community Communications Centres, and Telecottages globally along with the rapidly emerging field of electronically based virtual "communities". Michael Gurstein, Ph.D. is Executive Director of the Centre for Community Informatics Research, Development and Training (Vancouver BC), a Director of The Information Society Institute, Cape Peninsula University of Technology, Cape Town South Africa; and Research Professor in the School of Computer and Information Systems at the New Jersey Institute of Technology, Newark.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:07:49 GMT" } ]
2007-12-20T00:00:00
[ [ "Gurstein", "Michael", "" ] ]
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712.3221
Jianguo Cao
Jianguo Cao, Bo Dai, Jiaqiang Mei
An optimal extension of Perelman's comparison theorem for quadrangles and its applications
We corrected some inaccurate statements and definitions about development maps related to Corollary 2.4, based on Professor Stephanie Alexander's suggestions
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we discuss an extension of Perelman's comparison for quadrangles. Among applications of this new comparison theorem, we study the equidistance evolution of hypersurfaces in Alexandrov spaces with non-negative curvature. We show that, in certain cases, the equidistance evolution of hypersurfaces become totally convex relative to a bigger sub-domain. An optimal extension of 2nd variational formula for geodesics by Petrunin will be derived for the case of non-negative curvature. In addition, we also introduced the generalized second fundament forms for subsets in Alexandrov spaces. Using this new notion, we will propose an approach to study two open problems in Alexandrov geometry.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:08:35 GMT" }, { "version": "v2", "created": "Fri, 3 Apr 2009 17:57:00 GMT" } ]
2009-04-03T00:00:00
[ [ "Cao", "Jianguo", "" ], [ "Dai", "Bo", "" ], [ "Mei", "Jiaqiang", "" ] ]
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712.3222
Anna Aret
A. Sapar, A. Aret, L. Sapar, R. Poolam\"ae
A Pan-Spectral Method of Abundance Determination
4 pages, 2 figures, contribution presented at the ESO/Lisbon/Aveiro Workshop on Precision Spectroscopy in Astrophysics held in Aveiro, Portugal, 11-15 September 2006
In: Precision Spectroscopy in Astrophysics, ESO Astrophysics Symposia, Springer 2008, 145-148
10.1007/978-3-540-75485-5_32
null
astro-ph
null
We propose a new method for determination of element abundances in stellar atmospheres aimed for the automatic processing of high-quality stellar spectra. The pan-spectral method is based on weighted cumulative line-widths Q of studied element. Difference in quantities Q found from synthetic and observed spectra gives a correction to the initial abundance. Final abundances are then found by rapidly converging iterations. Calculations can be made for many elements simultaneously and do not demand supercomputers.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:12:50 GMT" } ]
2012-04-02T00:00:00
[ [ "Sapar", "A.", "" ], [ "Aret", "A.", "" ], [ "Sapar", "L.", "" ], [ "Poolamäe", "R.", "" ] ]
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712.3223
Pedro Jesus Salas
Pedro J. Salas
Simple fault-tolerant encoding over q-ary CSS quantum codes
null
Int. Journal of Quantum Information 5 (2007) 705-716
null
null
quant-ph
null
CSS codes are a subfamily of stabilizer codes especially appropriate for fault-tolerant quantum computations. A very simple method is proposed to encode a general qudit when a Calderbank-Shor-Steane quantum code, defined over a q-ary alphabet, is used.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:14:37 GMT" } ]
2007-12-20T00:00:00
[ [ "Salas", "Pedro J.", "" ] ]
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712.3224
Anastasios Avgoustidis
A. Avgoustidis
Cosmic String Dynamics and Evolution in Warped Spacetime
21 pages, 5 figures; Discussion section expanded, physical implications further explored; To appear in PRD
Phys.Rev.D78:023501,2008
10.1103/PhysRevD.78.023501
UB-ECM-PF-07/35, DAMTP-2007-121
hep-th astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the dynamics and evolution of Nambu-Goto strings in a warped spacetime, where the warp factor is a function of the internal coordinates giving rise to a `throat' region. The microscopic equations of motion for strings in this background include potential and friction terms, which attract the strings towards the bottom of the warping throat. However, by considering the resulting macroscopic equations for the velocities of strings in the vicinity of the throat, we note the absence of enough classical damping to guarantee that the strings actually reach the warped minimum and stabilise there. Instead, our classical analysis supports a picture in which the strings experience mere deflections and bounces around the tip, rather than strongly damped oscillations. Indeed, 4D Hubble friction is inefficient in the internal dimensions and there is no other classical mechanism known, which could provide efficient damping. These results have potentially important implications for the intercommuting probabilities of cosmic superstrings.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:15:10 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 15:05:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Avgoustidis", "A.", "" ] ]
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712.3225
Thomas B. Bahder
Paul A. Lopata, Thomas B. Bahder
Fishing for Eavesdroppers
21 pages, 1 figure. Submitted to Quantum Information & Computation journal
null
null
null
quant-ph
null
A method is given to detect the presence of eavesdroppers when a noisy message is sent to a privileged receiver. A proof of the effectiveness if this method is demonstrated, and a comparison is made to other quantum cryptographic tasks.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:21:40 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 17:52:38 GMT" } ]
2007-12-20T00:00:00
[ [ "Lopata", "Paul A.", "" ], [ "Bahder", "Thomas B.", "" ] ]
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712.3226
Harvey S. Reall
Harvey S. Reall
Counting the microstates of a vacuum black ring
7 pages
JHEP0805:013,2008
10.1088/1126-6708/2008/05/013
null
hep-th
null
The Bekenstein-Hawking entropy of an extremal vacuum black ring is derived from a microscopic counting of states. The entropy of extremal Kaluza-Klein black holes with ergospheres is also derived.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:32:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Reall", "Harvey S.", "" ] ]
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712.3227
Thomas Schulte-Herbr\"uggen
T. Schulte-Herbrueggen, A. Spoerl, and S.J. Glaser
Quantum CISC Compilation by Optimal Control and Scalable Assembly of Complex Instruction Sets beyond Two-Qubit Gates
substantially enlarged update with new sections; 19 pages, 17 figures; comments welcome
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a quantum CISC compiler and show how to assemble complex instruction sets in a scalable way. Enlarging the toolbox of universal gates by optimised complex multi-qubit instruction sets thus paves the way to fight decoherence for realistic settings. Compiling a quantum module into the machine code for steering a concrete quantum hardware device lends itself to be tackled by means of optimal quantum control. To this end, there are two opposite approaches: (i) one may use a decomposition into the restricted instruction set (RISC) of universal one- and two-qubit gates, which in turn have prefabricated translations into the machine code or (ii) one may prefer to generate the entire target module directly by a complex instruction set (CISC) of available controls. Here we advocate direct compilation up to the limit of system size a classical high-performance parallel computer cluster can reasonably handle. For going beyond these limits, i.e. for large systems we propose a combined way, namely (iii) to make recursive use of medium-sized building blocks generated by optimal control in the sense of a quantum CISC compiler. The advantage of the method over standard RISC compilations into one- and two-qubit universal gates is explored on the parallel cluster HLRB-II (with a total LINPACK performance of 63.3 TFlops/s) for the quantum Fourier transform, the indirect SWAP gate as well as for multiply-controlled CNOT gates. Implications for upper limits to time complexities are also derived.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:31:26 GMT" }, { "version": "v2", "created": "Mon, 22 Dec 2008 17:39:41 GMT" } ]
2008-12-22T00:00:00
[ [ "Schulte-Herbrueggen", "T.", "" ], [ "Spoerl", "A.", "" ], [ "Glaser", "S. J.", "" ] ]
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712.3228
Chris Sneden
Ian B. Thompson, Inese I. Ivans, Sara Bisterzo, Christopher Sneden, Roberto Gallino, Sylvie Vauclair, Gregory S. Burley, Stephen A. Shectman, George W. Preston
CS22964-161: A Double-Lined Carbon- and s-Process-Enhanced Metal-Poor Binary Star
manuscript, 7 tables, 13 figures. ApJ, in press
null
10.1086/529016
null
astro-ph
null
A detailed high-resolution spectroscopic analysis is presented for the carbon-rich low metallicity Galactic halo object CS 22964-161. We have discovered that CS 22964-161 is a double-lined spectroscopic binary, and have derived accurate orbital components for the system. From a model atmosphere analysis we show that both components are near the metal-poor main-sequence turnoff. Both stars are very enriched in carbon and in neutron-capture elements that can be created in the s-process, including lead. The primary star also possesses an abundance of lithium close to the value of the ``Spite-Plateau''. The simplest interpretation is that the binary members seen today were the recipients of these anomalous abundances from a third star that was losing mass as part of its AGB evolution. We compare the observed CS 22964-161 abundance set with nucleosynthesis predictions of AGB stars, and discuss issues of envelope stability in the observed stars under mass transfer conditions, and consider the dynamical stability of the alleged original triple star. Finally, we consider the circumstances that permit survival of lithium, whatever its origin, in the spectrum of this extraordinary system.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:36:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Thompson", "Ian B.", "" ], [ "Ivans", "Inese I.", "" ], [ "Bisterzo", "Sara", "" ], [ "Sneden", "Christopher", "" ], [ "Gallino", "Roberto", "" ], [ "Vauclair", "Sylvie", "" ], [ "Burley", "Gregory S.", "" ], [ "Shectman", "Stephen A.", "" ], [ "Preston", "George W.", "" ] ]
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712.3229
Luen-Chau Li
Luen-Chau Li
Long time behaviour for a class of low-regularity solutions of the Camassa-Holm equation
30 pages
Commun. Math. Phys. 285, 265-291 (2009)
10.1007/s00220-008-0603-5
null
math-ph math.MP math.SP
null
In this paper, we investigate the long time behaviour for a class of low-regularity solutions of the Camassa-Holm equation given by the superposition of infinitely many interacting traveling waves with corners at their peaks.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:39:04 GMT" } ]
2010-07-23T00:00:00
[ [ "Li", "Luen-Chau", "" ] ]
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712.323
Jan Draisma
Jan Draisma and Jochen Kuttler
On the ideals of equivariant tree models
23 pages. Greatly improved exposition, in part following suggestions by a referee--thanks! Also added example
Mathematische Annalen 344(3):619-644, 2009
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce equivariant tree models in algebraic statistics, which unify and generalise existing tree models such as the general Markov model, the strand symmetric model, and group based models. We focus on the ideals of such models. We show how the ideals for general trees can be determined from the ideals for stars. The main novelty is our proof that this procedure yields the entire ideal, not just an ideal defining the model set-theoretically. A corollary of theoretical importance is that the ideal for a general tree is generated by the ideals of its flattenings at vertices.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:46:31 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 10:24:00 GMT" }, { "version": "v3", "created": "Thu, 21 Aug 2008 15:34:59 GMT" } ]
2017-10-10T00:00:00
[ [ "Draisma", "Jan", "" ], [ "Kuttler", "Jochen", "" ] ]
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712.3231
Olivier Wintenberger
Paul Doukhan (CREST, CES), Olivier Wintenberger (CES, SAMOS)
Weakly dependent chains with infinite memory
Stochastic Processes and their Applications (2008) accept\'e
null
null
null
math.PR math.ST stat.TH
null
We prove the existence of a weakly dependent strictly stationary solution of the equation $ X_t=F(X_{t-1},X_{t-2},X_{t-3},...;\xi_t)$ called {\em chain with infinite memory}. Here the {\em innovations} $\xi_t$ constitute an independent and identically distributed sequence of random variables. The function $F$ takes values in some Banach space and satisfies a Lipschitz-type condition. We also study the interplay between the existence of moments and the rate of decay of the Lipschitz coefficients of the function $F$. With the help of the weak dependence properties, we derive Strong Laws of Large Number, a Central Limit Theorem and a Strong Invariance Principle.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:47:55 GMT" } ]
2007-12-20T00:00:00
[ [ "Doukhan", "Paul", "", "CREST, CES" ], [ "Wintenberger", "Olivier", "", "CES, SAMOS" ] ]
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712.3232
Vassilios Zamarias
Bertha Cuadros-Melgar, Eleftherios Papantonopoulos, Minas Tsoukalas, Vassilios Zamarias
String-Like BTZ on Codimension-2 Braneworlds in the Thin Brane Limit
Title changed, reference added, shortened to match the published version in Physical Review Letters
Phys.Rev.Lett.100:221601,2008
10.1103/PhysRevLett.100.221601
null
hep-th astro-ph gr-qc
null
We consider five-dimensional gravity with a Gauss-Bonnet term in the bulk and an induced gravity term on a 2-brane of codimension-2. We show that this system admits BTZ black holes on the 2-brane which are extended into the bulk with regular horizons.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:56:35 GMT" }, { "version": "v2", "created": "Sun, 4 May 2008 19:00:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Cuadros-Melgar", "Bertha", "" ], [ "Papantonopoulos", "Eleftherios", "" ], [ "Tsoukalas", "Minas", "" ], [ "Zamarias", "Vassilios", "" ] ]
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712.3233
Anton Akhmerov R
A. R. Akhmerov, J. H. Bardarson, A. Rycerz, C. W. J. Beenakker
Theory of the valley-valve effect in graphene nanoribbons
5 pages, 6 figures, v3 added more numerical data and an appendix with details of the calculation
Phys. Rev. B 77, 205416 (2008)
10.1103/PhysRevB.77.205416
null
cond-mat.mes-hall
null
A potential step in a graphene nanoribbon with zigzag edges is shown to be an intrinsic source of intervalley scattering -- no matter how smooth the step is on the scale of the lattice constant a. The valleys are coupled by a pair of localized states at the opposite edges, which act as an attractor/repellor for edge states propagating in valley K/K'. The relative displacement Delta along the ribbon of the localized states determines the conductance G. Our result G=(e^{2}/h)[1-\cos(N\pi+2\pi\Delta/3a)] explains why the ``valley-valve'' effect (the blocking of the current by a p-n junction) depends on the parity of the number N of carbon atoms across the ribbon.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 16:55:05 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 19:59:34 GMT" }, { "version": "v3", "created": "Thu, 17 Apr 2008 20:26:23 GMT" } ]
2015-10-12T00:00:00
[ [ "Akhmerov", "A. R.", "" ], [ "Bardarson", "J. H.", "" ], [ "Rycerz", "A.", "" ], [ "Beenakker", "C. W. J.", "" ] ]
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712.3234
Rahim Moosa
Rahim Moosa, Ruxandra Moraru, and Matei Toma
An essentially saturated surface not of Kaehler-type
10 pages
null
10.1112/blms/bdn063
null
math.CV math.LO
null
It is shown that if $X$ is an Inoue surface of type $S_M$ then the irreducible components of the Douady space of $X^n$ are compact, for all $n>0$. This gives an example of an essentially saturated compact complex manifold (in the sense of model theory) that is not of Kaehler-type. Among the known compact complex surfaces without curves, it is shown that these are the only examples.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:02:00 GMT" } ]
2014-02-26T00:00:00
[ [ "Moosa", "Rahim", "" ], [ "Moraru", "Ruxandra", "" ], [ "Toma", "Matei", "" ] ]
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712.3235
Andrew Callister
Andrew K. Callister and Douglas J. Smith
Topological BPS charges in 10 and 11-dimensional supergravity
64 pages, no figures, references added
Phys.Rev.D78:065042,2008
10.1103/PhysRevD.78.065042
null
hep-th
null
We consider the supersymmetry algebras of the 10 and 11 dimensional maximal supergravities. We construct expressions from which the topological charge structure of the algebras can be determined in supersymmetric curved backgrounds. These are interpreted as the topological charges of the 1/2-BPS states that are found in the theories. We consider charges for all the M-, NS- and D-branes as well as the Kaluza Klein monopoles. We also show that the dimensional reduction relations between the 11-d and IIA charges, and T-duality relations of the IIA and IIB charges match those found for the branes themselves. Finally we consider the massive versions of the IIA and 11-d theories and find that the expressions for the charges, with a slight modification, are still valid in those instances.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:07:31 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 15:27:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Callister", "Andrew K.", "" ], [ "Smith", "Douglas J.", "" ] ]
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712.3236
Achamveedu Gopakumar
Achamveedu Gopakumar
New Class of Gravitational Wave Templates for Inspiralling Compact Binaries
5 pages
null
null
null
gr-qc
null
Compact binaries inspiralling along quasi-circular orbits are the most plausible gravitational wave (GW) sources for the operational, planned and proposed laser interferometers. We provide new class of restricted post-Newtonian accurate GW templates for non-spinning compact binaries inspiralling along PN accurate quasi-circular orbits. Arguments based on data analysis, theoretical and astrophysical considerations are invoked to show why these time-domain Taylor approximants should be interesting to various GW data analysis communities.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:14:33 GMT" } ]
2007-12-20T00:00:00
[ [ "Gopakumar", "Achamveedu", "" ] ]
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712.3237
Kiril Datchev
Kiril Datchev
Local smoothing for scattering manifolds with hyperbolic trapped sets
16 pages. Published version available at http://www.springerlink.com/content/r663321331243288/?p=5ad2fe4778a742e4949de2030a409358&pi=11
Communications in Mathematical Physics, Vol. 286, No. 3, pp. 837-850, 2009
10.1007/s00220-008-0684-1
null
math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a resolvent estimate for the Laplace-Beltrami operator on a scattering manifold with a hyperbolic trapped set, and as a corollary deduce local smoothing. We use a result of Nonnenmacher-Zworski to provide an estimate near the trapped region, a result of Burq and Cardoso-Vodev to provide an estimate near infinity, and the microlocal calculus on scattering manifolds to combine the two.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:18:13 GMT" }, { "version": "v2", "created": "Wed, 27 Aug 2008 20:01:27 GMT" }, { "version": "v3", "created": "Thu, 29 Jan 2009 21:15:41 GMT" } ]
2012-06-06T00:00:00
[ [ "Datchev", "Kiril", "" ] ]
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712.3238
Jeffrey C. Lagarias
Jeffrey C Lagarias
The Schr\"odinger operator with Morse potential on the right half line
33 pages; v2 and v3 introduction revised, Polya and other refs. added, v4,v5 intro revised, typos corrected, v6 corrections to some details
Communications in Number Theory and Physics 3 (2009), No.2, 323--361
null
null
math.SP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the Schr\"odinger operator with Morse potential on a right half line [u, \infty) and determines the Weyl asymptotics of eigenvalues for constant boundary conditions. It obtains information on zeros of the Whittaker function $W_{\kappa, \mu}(x)$ for fixed real parameters $\kappa, x$, with x positive, viewed as an entire function of the complex variable $\mu$. In this case all zeros lie on the imaginary axis, with the exception, if $k<0$, of a finite number of real zeros. We obtain an asymptotic formula for the number of zeros of modulus at most T of form $N(T) = (2/\pi) T \log T + f(u) T + O(1)$. Some parallels are noted with zeros of the Riemann zeta function.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:25:42 GMT" }, { "version": "v2", "created": "Tue, 11 Nov 2008 19:15:09 GMT" }, { "version": "v3", "created": "Tue, 16 Dec 2008 03:30:17 GMT" }, { "version": "v4", "created": "Thu, 18 Dec 2008 19:59:12 GMT" }, { "version": "v5", "created": "Fri, 26 Jun 2009 19:54:48 GMT" }, { "version": "v6", "created": "Tue, 18 Aug 2009 19:21:10 GMT" } ]
2010-12-09T00:00:00
[ [ "Lagarias", "Jeffrey C", "" ] ]
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712.3239
Manfred Cuntz
J. Eberle, M. Cuntz, Z. E. Musielak
Orbital Stability of Planets in Binary Systems: A New Look at Old Results
3 pages, 1 figure; submitted to: Exoplanets: Detection, Formation and Dynamics, IAU Symposium 249, eds. Y.-S. Sun, S. Ferraz-Mello, and J.-L. Zhou (Cambridge: Cambridge University Press)
null
10.1017/S1743921308017043
null
astro-ph
null
About half of all known stellar systems with Sun-like stars consist of two or more stars, significantly affecting the orbital stability of any planet in these systems. This observational evidence has prompted a large array of theoretical research, including the derivation of mathematically stringent criteria for the orbital stability of planets in stellar binary systems, valid for the "coplanar circular restricted three-body problem". In the following, we use these criteria to explore the validity of results from previous theoretical studies.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:03:55 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 21:17:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Eberle", "J.", "" ], [ "Cuntz", "M.", "" ], [ "Musielak", "Z. E.", "" ] ]
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712.324
Ryan Gutenkunst
Ryan N. Gutenkunst and James P. Sethna
Adaptive mutation of biochemical reaction constants: Fisher's geometrical model without pleiotropy
9 pages, 4 figures, submitted
null
null
LA-UR: 10-04348
q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The distribution of fitness effects of adaptive mutations remains poorly understood, both empirically and theoretically. We study this distribution using a version of Fisher's geometrical model without pleiotropy, such that each mutation affects only a single trait. We are motivated by the notion of an organism's chemotype, the set of biochemical reaction constants that govern its molecular constituents. From physical considerations, we expect the chemotype to be of high dimension and to exhibit very little pleiotropy. Our model generically predicts striking cusps in the distribution of the fitness effects of arising and fixed mutations. It further predicts that a single element of the chemotype should comprise all mutations at the high-fitness ends of these distributions. Using extreme value theory, we show that the two cusps with the highest fitnesses are typically well-separated, even when the chemotype possesses thousands of elements; this suggests a means to observe these cusps experimentally. More broadly, our work demonstrates that new insights into evolution can arise from the chemotype perspective, a perspective between the genotype and the phenotype.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:20:28 GMT" }, { "version": "v2", "created": "Mon, 28 Jun 2010 20:12:19 GMT" } ]
2015-03-13T00:00:00
[ [ "Gutenkunst", "Ryan N.", "" ], [ "Sethna", "James P.", "" ] ]
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712.3241
Efrat Shimshoni
G. Venketeswara Pai, E. Shimshoni and N. Andrei
Resistivity of Inhomogeneous Superconducting Wires
10 pages, 3 colored figures
Phys. Rev. B 77, 104528 (2008).
null
null
cond-mat.supr-con cond-mat.str-el
null
We study the contribution of quantum phase fluctuations in the superconducting order parameter to the low--temperature resistivity $\rho(T)$ of a dirty and inhomogeneous superconducting wire. In particular, we account for random spatial fluctuations of arbitrary size in the wire thickness. For a typical wire thickness above the critical value for superconductor--insulator transition, phase--slips processes can be treated perturbatively. We use a memory formalism approach, which underlines the role played by weak violation of conservation laws in the mechanism for generating finite resistivity. Our calculations yield an expression for $\rho(T)$ which exhibits a smooth crossover from a homogeneous to a ``granular'' limit upon increase of $T$, controlled by a ``granularity parameter'' $D$ characterizing the size of thickness fluctuations. For extremely small $D$, we recover the power--law dependence $\rho(T)\sim T^\alpha$ obtained by unbinding of quantum phase--slips. However in the strongly inhomogeneous limit, the exponent $\alpha$ is modified and the prefactor is {\em exponentially enhanced}. We examine the dependence of the exponent $\alpha$ on an external magnetic field applied parallel to the wire. Finally, we show that the power--law dependence at low $T$ is consistent with a series of experimental data obtained in a variety of long and narrow samples. The values of $\alpha$ extracted from the data, and the corresponding field dependence, are consistent with known parameters of the corresponding samples.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:32:47 GMT" } ]
2009-01-27T00:00:00
[ [ "Pai", "G. Venketeswara", "" ], [ "Shimshoni", "E.", "" ], [ "Andrei", "N.", "" ] ]
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712.3242
Daniel Sudarsky
Daniel Sudarsky
Unspeakables and the Epistemological path towards Quantum Gravity
Invited article for "GRF2007 Special Issue of " IJMPD . In press
Int.J.Mod.Phys.D17:425-443,2008
10.1142/S0218271808012103
null
gr-qc
null
We offer a critical assessment of some generic features of various of the current approaches towards the construction of a Theory of Quantum Gravity. We will argue that there is a need for further conceptual clarifications before such an enterprise can be launched on a truly well grounded setting, and that one of the guiding principles that can be viewed as part of the reasons for successes of the past theoretical developments is the identification of Unspeakables: Concepts that should not only play no role in the formulation of the theories, but ones that the formalism of the theory itself should prevent from ever been spoken about.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:35:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Sudarsky", "Daniel", "" ] ]
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712.3243
Nathan M. Dunfield
Nathan M. Dunfield and Dinakar Ramakrishnan
Increasing the number of fibered faces of arithmetic hyperbolic 3-manifolds
42 pages, 7 figures; V2: minor improvements, to appear in Amer. J. Math
Amer. J. Math 132 (2010), 53-97
10.1353/ajm.0.0098
null
math.GT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We exhibit a closed hyperbolic 3-manifold which satisfies a very strong form of Thurston's Virtual Fibration Conjecture. In particular, this manifold has finite covers which fiber over the circle in arbitrarily many ways. More precisely, it has a tower of finite covers where the number of fibered faces of the Thurston norm ball goes to infinity, in fact faster than any power of the logarithm of the degree of the cover, and we give a more precise quantitative lower bound. The example manifold M is arithmetic, and the proof uses detailed number-theoretic information, at the level of the Hecke eigenvalues, to drive a geometric argument based on Fried's dynamical characterization of the fibered faces. The origin of the basic fibration of M over the circle is the modular elliptic curve E=X_0(49), which admits multiplication by the ring of integers of Q[sqrt(-7)]. We first base change the holomorphic differential on E to a cusp form on GL(2) over K=Q[sqrt(-3)], and then transfer over to a quaternion algebra D/K ramified only at the primes above 7; the fundamental group of M is a quotient of the principal congruence subgroup of level 7 of the multiplicative group of a maximal order of D. To analyze the topological properties of M, we use a new practical method for computing the Thurston norm, which is of independent interest. We also give a non-compact finite-volume hyperbolic 3-manifold with the same properties by using a direct topological argument.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:37:24 GMT" }, { "version": "v2", "created": "Tue, 16 Dec 2008 19:54:19 GMT" } ]
2010-06-01T00:00:00
[ [ "Dunfield", "Nathan M.", "" ], [ "Ramakrishnan", "Dinakar", "" ] ]
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712.3244
Prabir Pal
M. Chakraborty, P. Pal and B. R. Sekhar
Half Metallicity in Pr$_{0.75}$Sr$_{0.25}$MnO$_3$: A first Principle study
8 pages, 3 figures
Solid State Communications 145 (2008) 197-200
10.1016/j.ssc.2007.10.025
null
cond-mat.str-el cond-mat.mtrl-sci
null
In this communication we present a first principle study of Pr$_{1-x}$Sr$_{x}$MnO$_3$ with $x = 0.25$. While the parent compounds of this system are antiferromagnetic insulators with different structural and magnetic ground states, the $x = 0.25$ is in the colossal magnetoresistance regime of the Pr$_{1-x}$Sr$_{x}$MnO$_3$ phase diagram [C. Martin, A. Maignan, M. Hervieu, B. Raveau, Phys. Rev. B 60 (1999) 12191]. Our band structure calculations for the end-point compounds matches well with the existing theoretical and experimental results [C. Martin, A. Maignan, M. Hervieu, B. Raveau, Phys. Rev. B 60 (1999) 12191; Rune Sondena, P. Ravindran, Svein Stolen, Tor Grande, Michael Hanfland, Phys. Rev. B 74 (2006) 144102]. Interestingly, our calculations show that the Pr$_{0.75}$Sr$_{0.25}$MnO$_3$ has a half-metallic character with a huge band gap of 2.8 eV in the minority band. We believe this result would fuel further interest in some of these special compositions of colossal magnetoresistive manganites as they could be potential candidates for spintronic devices. We discuss the half-metallicity of the Pr$_{0.75}$Sr$_{0.25}$MnO$_3$ in the light of changes in the orbital hybridization as a result of Sr doping in PrMnO$_3$. Further, we highlight the importance of half-metallicity for a consolidated understanding of colossal magnetoresistance effect.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:38:29 GMT" } ]
2007-12-20T00:00:00
[ [ "Chakraborty", "M.", "" ], [ "Pal", "P.", "" ], [ "Sekhar", "B. R.", "" ] ]
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712.3245
Denis I. Borisov
Denis Borisov and Pedro Freitas
Singular asymptotic expansions for Dirichlet eigenvalues and eigenfunctions of the Laplacian on thin planar domains
null
null
null
null
math.SP math-ph math.MP
null
We consider the Laplace operator with Dirichlet boundary conditions on a planar domain and study the effect that performing a scaling in one direction has on the spectrum. We derive the asymptotic expansion for the eigenvalues and corresponding eigenfunctions as a function of the scaling parameter around zero. This method allows us, for instance, to obtain an approximation for the first Dirichlet eigenvalue for a large class of planar domains, under very mild assumptions.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:40:27 GMT" } ]
2007-12-20T00:00:00
[ [ "Borisov", "Denis", "" ], [ "Freitas", "Pedro", "" ] ]
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712.3246
Remo Garattini
Remo Garattini
Extracting the Cosmological Constant from the Wheeler DeWitt Equation in a Modified Gravity Theory
Talk given at QFEXT 07, Workshop on Quantum Field Theory Under the Influence of External Conditions, Leipzig, 17-21 Sep 2007 and talk given at 9th International Conference on Path Integrals - New Trends and Perspectives, Dresden, 23-28 September 2007. 8 pages, accepted for publication in Journal of Physics A
J.Phys.A41:164057,2008
10.1088/1751-8113/41/16/164057
null
gr-qc hep-th
null
We discuss how to extract information about the cosmological constant from the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville problem. A generalization to a f(R)theory is taken under examination. The equation is approximated to one loop with the help of a variational approach with Gaussian trial wave functionals. We use a zeta function regularization to handle with divergences. A renormalization procedure is introduced to remove the infinities together with a renormalization group equation.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:03:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Garattini", "Remo", "" ] ]
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712.3247
Tomasz Dietl
Hideo Ohno and Tomasz Dietl
Spin-transfer physics and the model of ferromagnetism in (Ga,Mn)As
13 pages, 1 figure, to be published in J. Magn. Magn. Materials, section "Current Perspectives"
J. Magn. Magn. Mat. 320 (2008) 1293--1299
10.1016/j.jmmm.2007.12.016
null
cond-mat.mtrl-sci cond-mat.str-el
null
We describe recent progress and open questions in the physics of current-induced domain-wall displacement and creep in (Ga,Mn)As. Furthermore, the reasons are recalled why, despite strong disorder and localization, the p-d Zener model is suitable for the description of this system.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:55:50 GMT" } ]
2013-11-15T00:00:00
[ [ "Ohno", "Hideo", "" ], [ "Dietl", "Tomasz", "" ] ]
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712.3248
Fabio Perroni
Samuel Boissiere, Etienne Mann, Fabio Perroni
The cohomological crepant resolution conjecture for P(1,3,4,4)
11 pages, 1 figure
null
null
null
math.AG
null
We prove the cohomological crepant resolution conjecture of Ruan for the weighted projective space P(1,3,4,4). To compute the quantum corrected cohomology ring we combine the results of Coates-Corti-Iritani-Tseng on P(1,1,1,3) and our previous results.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 17:57:23 GMT" } ]
2007-12-20T00:00:00
[ [ "Boissiere", "Samuel", "" ], [ "Mann", "Etienne", "" ], [ "Perroni", "Fabio", "" ] ]
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712.3249
Stephan Schulz
Stephan Schulz, Ulrich Poschinger, Frank Ziesel, and Ferdinand Schmidt-Kaler
Sideband cooling and coherent dynamics in a microchip multi-segmented ion trap
17 pages, 11 figures
null
10.1088/1367-2630/10/4/045007
null
quant-ph
null
Miniaturized ion trap arrays with many trap segments present a promising architecture for scalable quantum information processing. The miniaturization of segmented linear Paul traps allows partitioning the microtrap in different storage and processing zones. The individual position control of many ions - each of them carrying qubit information in its long-lived electronic levels - by the external trap control voltages is important for the implementation of next generation large-scale quantum algorithms. We present a novel scalable microchip multi-segmented ion trap with two different adjacent zones, one for the storage and another dedicated for the processing of quantum information using single ions and linear ion crystals: A pair of radio-frequency driven electrodes and 62 independently controlled DC electrodes allows shuttling of single ions or linear ion crystals with numerically designed axial potentials at axial and radial trap frequencies of a few MHz. We characterize and optimize the microtrap using sideband spectroscopy on the narrow S1/2 <-> D5/2 qubit transition of the 40Ca+ ion, demonstrate coherent single qubit Rabi rotations and optical cooling methods. We determine the heating rate using sideband cooling measurements to the vibrational ground state which is necessary for subsequent two-qubit quantum logic operations. The applicability for scalable quantum information processing is proven.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:16:08 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 23:38:16 GMT" }, { "version": "v3", "created": "Sun, 3 Feb 2008 20:26:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Schulz", "Stephan", "" ], [ "Poschinger", "Ulrich", "" ], [ "Ziesel", "Frank", "" ], [ "Schmidt-Kaler", "Ferdinand", "" ] ]
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712.325
Edyta Podlewska
E. Podlewska and E. Szuszkiewicz (Institute of Physics and CASA*, University of Szczecin, Poland)
Jupiter and Super-Earth embedded in a gaseous disc
10 pages with 8 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12871.x
null
astro-ph
null
In this paper we investigate the evolution of a pair of interacting planets - a Jupiter mass planet and a Super-Earth with the 5.5 Earth masses - orbiting a Solar type star and embedded in a gaseous protoplanetary disc. We focus on the effects of type I and II orbital migrations, caused by the planet-disc interaction, leading to the Super-Earth capture in first order mean motion resonances by the Jupiter. The stability of the resulting resonant system in which the Super-Earth is on the internal orbit relatively to the Jupiter has been studied numerically by means of full 2D hydrodynamical simulations. Our main motivation is to determine the Super-Earth behaviour in the presence of the gas giant in the system. It has been found that the Jupiter captures the Super-Earth into the interior 3:2 or 4:3 mean motion resonances and the stability of such configurations depends on the initial planet positions and eccentricity evolution. If the initial separation of planet orbits is larger or close to that required for the exact resonance than the final outcome is the migration of the pair of planets with the rate similar to that of the gas giant at least for time of our simulations. Otherwise we observe a scattering of the Super-Earth from the disc. The evolution of planets immersed in the gaseous disc has been compared with their behaviour in the case of the classical three-body problem when the disc is absent.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:42:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Podlewska", "E.", "", "Institute of Physics and CASA*,\n University of Szczecin, Poland" ], [ "Szuszkiewicz", "E.", "", "Institute of Physics and CASA*,\n University of Szczecin, Poland" ] ]
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712.3251
Robert Carroll
Robert Carroll
Remarks on the Friedman equations
13 pages, Latex, typos corrected
null
null
null
math-ph math.MP
null
We give some heuristic results for FRW situations with Ricci flow.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:34:49 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 17:43:36 GMT" } ]
2011-11-10T00:00:00
[ [ "Carroll", "Robert", "" ] ]
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712.3252
Valerio Faraoni
Valerio Faraoni and Nicolas Lanahan-Tremblay (Bishop's University)
Comments on "Solar System constraints to general f(R) gravity"
2 latex pages, to appear in the Comments section of Phys. Rev. D. A statement corrected, acknowledgments updated
Phys.Rev.D77:108501,2008
10.1103/PhysRevD.77.108501
null
gr-qc
null
We comment on, and complete, the analysis of the weak field limit of metric f(R) gravity in T. Chiba, T.L. Smith, and A.L. Erickcek, Phys. Rev. D 75, 124014 (2007).
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:42:26 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 16:51:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Faraoni", "Valerio", "", "Bishop's University" ], [ "Lanahan-Tremblay", "Nicolas", "", "Bishop's University" ] ]
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712.3253
Miron Amusia
M. Ya. Amusia (1 and 2), A. S. Baltenkov (3), L. V. Chernysheva ((1) Hebrew University, Jerusalem, Israel, (2) Ioffe Physical-Technical Institute, St. Petersburg, Russia, (3) Arifov Institute of Electronics, Tashkent, Uzbekistan)
Destruction and Resurrection of Atomic Giant resonances in Endohedral Atoms A@C60
25 pages, 29 figures
null
null
null
physics.atm-clus physics.atom-ph
null
It is demonstrated that in photoabsorption by endohedral atoms some atomic Giant resonances are almost completely destroyed while the others are totally preserved due to different action on it of the fullerenes shell. As the first example we discuss the 4d10 Giant resonance in Xe@C60 whereas as the second serves the Giant autoionization resonance in Eu@C60. The qualitative difference comes from the fact that photoelectrons from the 4d Giant resonance has small energies (tens of eV) and are strongly reflected by the C60 fullerenes shell. As to the Eu@C60, Giant autoionization leads to fast photoelectrons (about hundred eV) that go out almost untouched by the C60 shell. As a result of the outgoing electrons energy difference the atomic Giant resonances will be largely destroyed in A@C60 while the Giant autoionization resonance will be almost completely preserved. Thus, on the way from Xe@C60 Giant resonance to Eu@C60 Giant autoionization resonance the oscillation structure should disappear. Similar will be the decrease of oscillations on the way from pure Giant to pure Giant autoionization resonances for the angular anisotropy parameters. At Giant resonance frequencies the role of polarization of the fullerenes shell by the incoming photon beam is inessential. Quite different is the situation for the outer electrons in Eu@C60, the photoionization of which will be also considered.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:46:56 GMT" } ]
2007-12-20T00:00:00
[ [ "Amusia", "M. Ya.", "", "1 and 2" ], [ "Baltenkov", "A. S.", "" ], [ "Chernysheva", "L. V.", "" ] ]
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712.3254
Carlo Barbieri
C. Barbieri (1), E. Caurier (2), K. Langanke (1,2), G. Mart\'inez-Pinedo (1) ((1) GSI, (2) IRES Strasbourg, (3) TU Darmstadt)
Pygmy dipole response of proton rich argon beyond the random phase approximation
Submitted to Phys. Rev. C
null
null
null
nucl-th
null
The occurrence of a pygmy dipole resonance in proton rich Ar-32 and Ar-34 is studied using the unitary correlator operator method interaction Vucom, based on Argonne V18. Predictions from the random phase approximation (RPA) and the shell model in a no-core basis are compared. It is found that the inclusion of configuration mixing up to two-particle--two-holes broadens the pygmy strength slightly and reduces sensibly its strength, as compared to the RPA predictions. For Ar-32 a clear peak associated with a pygmy resonance is found. For Ar-34, the pygmy states are obtained close to the giant dipole resonance and mix with it.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 18:55:33 GMT" } ]
2007-12-20T00:00:00
[ [ "Barbieri", "C.", "", "GSI" ], [ "Caurier", "E.", "", "IRES Strasbourg" ], [ "Langanke", "K.", "", "GSI", "IRES Strasbourg" ], [ "Martínez-Pinedo", "G.", "", "GSI" ] ]
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712.3255
Georgios Mountrichas
Georgios Mountrichas, Tom Shanks
Clustering of 2PIGG galaxy groups with 2dFGRS galaxies
20 pages, 32 figures, 9 tables
null
10.1111/j.1365-2966.2009.15162.x
null
astro-ph
null
Prompted by indications from QSO lensing that there may be more mass associated with galaxy groups than expected, we have made new dynamical infall estimates of the masses associated with 2PIGG groups and clusters. We have analysed the redshift distortions in the cluster-galaxy cross-correlation function as a function of cluster membership, cross-correlating z<0.12 2PIGG clusters and groups with the full 2dF galaxy catalogue. We have made estimates of the dynamical infall parameter beta and new estimates of the group velocity dispersions. We first find that the amplitude of the full 3-D redshift space cross-correlation function, xi_{cg}, rises monotonically with group membership. We use a simple linear-theory infall model to fit xi(sigma, pi) in the range 5<s<40h^{-1}Mpc. We find that the beta versus membership relation for the data shows a minimum at intermediate group membership n~20 or L~2x10^11h^-2Lsun, implying that the bias and hence M/L ratios rise by a significant factor (~5x) both for small groups and rich clusters. However, the mocks show a systematic shift between the location of the beta minimum and the M/L minimum at L~10^10h^-2Lsun given by direct calculation using the known DM distribution. Our overall conclusion is that bias estimates from dynamical infall appear to support the minimum in star-formation efficiency at intermediate halo masses. Nevertheless, there may still be significant systematic problems arising from measuring beta~1/b using large-scale infall rather than M/L using small-scale velocity dispersions.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:32:40 GMT" } ]
2015-05-13T00:00:00
[ [ "Mountrichas", "Georgios", "" ], [ "Shanks", "Tom", "" ] ]
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712.3256
Gregory F. Lawler
Gregory F. Lawler
Schramm-Loewner Evolution
Lecture notes from course given at Park City/IAS Institute, Park City, Utah, 2007
null
null
null
math.PR
null
This is the first expository set of notes on SLE I have written since publishing a book two years ago [45]. That book covers material from a year-long class, so I cannot cover everything there. However, these notes are not just a subset of those notes, because there is a slight change of perspective. The main differences are: o I have defined SLE as a finite measure on paths that is not necessarily a probability measure. This seems more natural from the perspective of limits of lattice systems and seems to be more useful when extending SLE to non-simply connected domains. (However, I do not discuss non-simply connected domains in these notes.) o I have made more use of the Girsanov theorem in studying corresponding martingales and local martingales. As in [45], I will focus these notes on the continuous process SLE and will not prove any results about convergence of discrete processes to SLE. However, my first lecture will be about discrete processes -- it is very hard to appreciate SLE if one does not understand what it is trying to model.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:19:50 GMT" } ]
2007-12-20T00:00:00
[ [ "Lawler", "Gregory F.", "" ] ]
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712.3257
Manfred Cuntz
M. Cuntz, L. Gurdemir, E. F. Guinan, R. L. Kurucz
Astrobiological Effects of F, G, K and M Main-Sequence Stars
3 pages, 3 figures; submitted to: Exoplanets: Detection, Formation and Dynamics, IAU Symposium 249, eds. Y.S. Sun and S. Ferraz-Mello (San Francisco: Astr. Soc. Pac.)
null
10.1017/S174392130801661X
null
astro-ph
null
We focus on the astrobiological effects of photospheric radiation produced by main-sequence stars of spectral types F, G, K, and M. The photospheric radiation is represented by using realistic spectra, taking into account millions or hundred of millions of lines for atoms and molecules. DNA is taken as a proxy for carbon-based macromolecules, assumed to be the chemical centerpiece of extraterrestrial life forms. Emphasis is placed on the investigation of the radiative environment in conservative as well as generalized habitable zones.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:54:21 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 21:04:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Cuntz", "M.", "" ], [ "Gurdemir", "L.", "" ], [ "Guinan", "E. F.", "" ], [ "Kurucz", "R. L.", "" ] ]
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712.3258
Nicolo' Antonietti
N. Antonietti, M. Mondin, G. Catastini, G. Brida, and M. Genovese
Systematic Numerical Study of the Propagation of Monochromatic Radiation through a Stationary Atmosphere in a Model of Plane Plane-Parallel Layers
null
Laser Physics, 2007, Vol. 17, No. 12, pp. 1389-1397
10.1134/S1054660X07120092
null
physics.optics quant-ph
null
In this paper, the authors compare the security bounds for different quantum communication protocols with the numerically evaluated losses in the transmission channel, due to the interaction between the atmosphere and the photon, which is the information carrier. The analysis is carried out using a free-source library, which can solve the radiative transfer equation for a parallel-plane atmosphere.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:12:35 GMT" }, { "version": "v2", "created": "Wed, 26 Dec 2007 20:17:02 GMT" } ]
2008-01-02T00:00:00
[ [ "Antonietti", "N.", "" ], [ "Mondin", "M.", "" ], [ "Catastini", "G.", "" ], [ "Brida", "G.", "" ], [ "Genovese", "M.", "" ] ]
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712.3259
Johan Nilsson
Johan Nilsson, A. H. Castro Neto, F. Guinea, N. M. R. Peres
Electronic properties of bilayer and multilayer graphene
36 pages, 42 figures, references added
Phys. Rev. B 78, 045405 (2008)
10.1103/PhysRevB.78.045405
null
cond-mat.mes-hall
null
We study the effects of site dilution disorder on the electronic properties in graphene multilayers, in particular the bilayer and the infinite stack. The simplicity of the model allows for an easy implementation of the coherent potential approximation and some analytical results. Within the model we compute the self-energies, the density of states and the spectral functions. Moreover, we obtain the frequency and temperature dependence of the conductivity as well as the DC conductivity. The c-axis response is unconventional in the sense that impurities increase the response for low enough doping. We also study the problem of impurities in the biased graphene bilayer.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:01:03 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 14:46:21 GMT" } ]
2008-07-03T00:00:00
[ [ "Nilsson", "Johan", "" ], [ "Neto", "A. H. Castro", "" ], [ "Guinea", "F.", "" ], [ "Peres", "N. M. R.", "" ] ]
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712.326
Manfred Cuntz
M. Cuntz, L. Gurdemir, E.F. Guinan, R. L. Kurucz
Astrobiology in the Environments of Main-Sequence Stars: Effects of Photospheric Radiation
4 pages, 4 figures; submitted to: Bioastronomy 2007: Molecules, Microbes and Extraterrestrial Life, eds. K. Meech, M. Mumma, J. Siefert and D. Werthimer, A.S.P. Conf. Ser
null
null
null
astro-ph
null
We explore if carbon-based macromolecules (such as DNA) in the environments of stars other than the Sun are able to survive the effects of photospheric stellar radiation, such as UV-C. Therefore, we focus on main-sequence stars of spectral types F, G, K, and M. Emphasis is placed on investigating the radiative environment in the stellar habitable zones. Stellar habitable zones are relevant to astrobiology because they constitute circumstellar regions in which a planet of suitable size can maintain surface temperatures for water to exist in fluid form, thus increasing the likelihood of Earth-type life.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:25:24 GMT" } ]
2007-12-20T00:00:00
[ [ "Cuntz", "M.", "" ], [ "Gurdemir", "L.", "" ], [ "Guinan", "E. F.", "" ], [ "Kurucz", "R. L.", "" ] ]
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712.3261
Marcin Bilski
Marcin Bilski
Algebraic approximation of analytic sets and mappings
23 pages
J. Math. Pures Appl. 90 (2008) 312-327
null
null
math.CV
null
Let {X_n} be a sequence of analytic sets converging to some analytic set X in the sense of holomorphic chains. We introduce a condition which implies that every irreducible component of X is the limit of a sequence of irreducible components of the sets from {X_n}. Next we apply the condition to approximate a holomorphic solution y=f(x) of a system Q(x,y)=0 of Nash equations by Nash solutions. Presented methods allow to construct an algorithm of approximation of the holomorphic solutions.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:25:40 GMT" } ]
2008-10-23T00:00:00
[ [ "Bilski", "Marcin", "" ] ]
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712.3262
Wei Wu
Wei Wu, A. Kerridge, A. H. Harker and A. J. Fisher
Structure-dependent exchange in the organic magnets Cu(II)Pc and Mn(II)Pc
13 pages,10 figures. To appear in Physical Review B
null
10.1103/PhysRevB.77.184403
QIP07_WW3_CuPcMnPc
cond-mat.mtrl-sci
null
We study exchange couplings in the organic magnets copper(II) phthalocyanine (Cu(II)Pc) and manganese(II) phthalocyanine (Mn(II)Pc) by a combination of Green's function perturbation theory and \textsl{ab initio} density-functional theory (DFT). Based on the indirect exchange model our perturbation-theory calculation of Cu(II)Pc qualitatively agrees with the experimental observations. DFT calculations performed on Cu(II)Pc dimer show a very good quantitative agreement with exchange couplings that we extract by using a global fitting for the magnetization measurements to a spin-1/2 Bonner-Fisher model. These two methods give us remarkably consistent trends for the exchange couplings in Cu(II)Pc when changing the stacking angles. The situation is more complex for Mn(II)Pc owing to the competition between super-exchange and indirect exchange.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:52:34 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 19:48:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Wu", "Wei", "" ], [ "Kerridge", "A.", "" ], [ "Harker", "A. H.", "" ], [ "Fisher", "A. J.", "" ] ]
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712.3263
Gregory F. Lawler
Gregory F. Lawler
Dimension and natural parametrization for SLE curves
null
null
null
null
math.PR math-ph math.MP
null
Some possible definitions for the natural parametrization of SLE (Schramm-Loewner evolution) paths are proposed in terms of various limits. One of the definitions is used to give a new proof of the Hausdorff dimension of SLE paths.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:32:04 GMT" } ]
2007-12-20T00:00:00
[ [ "Lawler", "Gregory F.", "" ] ]
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712.3264
Elizabeth Untiedt
Elizabeth Untiedt and Weldon Lodwick
Using Gradual Numbers to Analyze Non-Monotonic Functions of Fuzzy Intervals
null
null
null
null
math.OC
null
Gradual numbers have been introduced recently as a means of extending standard interval computation methods to fuzzy intervals. The literature treats monotonic functions of fuzzy intervals. In this paper, we combine the concepts of gradual numbers and optimization, which allows for the evaluation of any differentiable function on fuzzy intervals, with no monotonicity requirement.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:32:45 GMT" } ]
2007-12-20T00:00:00
[ [ "Untiedt", "Elizabeth", "" ], [ "Lodwick", "Weldon", "" ] ]
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712.3265
Pietro Slavich
G. Degrassi, P. Gambino and P. Slavich
SusyBSG: a fortran code for BR[B -> Xs gamma] in the MSSM with Minimal Flavor Violation
27 pages, 2 figures; v2 to appear in Comput.Phys.Commun. - refers to version 1.1 of the code; v3: note added on title page
Comput.Phys.Commun.179:759-771,2008
10.1016/j.cpc.2008.06.012
RM3-TH/07-19, DFTT-28/2007, LAPTH-1225/07, CERN-PH-TH/2007-265
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the fortran code SusyBSG version 1.1, which computes the branching ratio for the decay B -> Xs gamma in the MSSM with Minimal Flavor Violation. The computation takes into account all the available NLO contributions, including the complete supersymmetric QCD corrections to the Wilson coefficients of the magnetic and chromomagnetic operators.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:36:23 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 13:59:49 GMT" }, { "version": "v3", "created": "Mon, 14 Feb 2011 12:06:03 GMT" } ]
2011-02-15T00:00:00
[ [ "Degrassi", "G.", "" ], [ "Gambino", "P.", "" ], [ "Slavich", "P.", "" ] ]
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712.3266
Manfred Cuntz
J. Eberle, M. Cuntz, Z. E. Musielak
Orbital Stability of Earth-Type Planets in Binary Systems
4 pages, 1 figure; submitted to: Bioastronomy 2007: Molecules, Microbes and Extraterrestrial Life, eds. K. Meech, M. Mumma, J. Siefert and D. Werthimer, A.S.P. Conf. Ser
null
null
null
astro-ph
null
About half of all known stellar systems with Sun-like stars consist of two or more stars, significantly affecting the orbital stability of any planet in these systems. Here we study the onset of instability for an Earth-type planet that is part of a binary system. Our investigation makes use of previous analytical work allowing to describe the permissible region of planetary motion. This allows us to establish a criterion for the orbital stability of planets that may be useful in the context of future observational and theoretical studies.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:38:49 GMT" } ]
2007-12-20T00:00:00
[ [ "Eberle", "J.", "" ], [ "Cuntz", "M.", "" ], [ "Musielak", "Z. E.", "" ] ]
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712.3267
Alberto Girlando
A. Girlando, M. Masino, A. Painelli, N. Drichko, M. Dressel, A. Brillante, R. G. Della Valle, and E. Venuti
Direct evidence of overdamped Peierls-coupled modes in TTF-CA temperature-induced phase transition
11 pages, 13 figures
Phys. Rev. B 78, 045103 (2008)
10.1103/PhysRevB.78.045103
null
cond-mat.other
null
In this paper we elucidate the optical response resulting from the interplay of charge distribution (ionicity) and Peierls instability (dimerization) in the neutral-ionic, ferroelectric phase transition of tetrathiafulvalene-chloranil (TTF-CA), a mixed-stack quasi-one-dimensional charge-transfer crystal. We present far-infrared reflectivity measurements down to 5 cm-1 as a function of temperature above the phase transition (300 - 82 K). The coupling between electrons and lattice phonons in the pre-transitional regime is analyzed on the basis of phonon eigenvectors and polarizability calculations of the one-dimensional Peierls-Hubbard model. We find a multi-phonon Peierls coupling, but on approaching the transition the spectral weight and the coupling shift progressively towards the phonons at lower frequencies, resulting in a soft-mode behavior only for the lowest frequency phonon near the transition temperature. Moreover, in the proximity of the phase transition, the lowest-frequency phonon becomes overdamped, due to anharmonicity induced by its coupling to electrons. The implications of these findings for the neutral-ionic transition mechanism is shortly discussed.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 19:46:04 GMT" } ]
2021-11-23T00:00:00
[ [ "Girlando", "A.", "" ], [ "Masino", "M.", "" ], [ "Painelli", "A.", "" ], [ "Drichko", "N.", "" ], [ "Dressel", "M.", "" ], [ "Brillante", "A.", "" ], [ "Della Valle", "R. G.", "" ], [ "Venuti", "E.", "" ] ]
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712.3268
Adan Cabello
Adan Cabello, David Rodriguez, Ignacio Villanueva
Necessary and sufficient detection efficiency for the Mermin inequalities
REVTeX4, 5 pages, 1 figure
Phys. Rev. Lett. 101 (2008) 120402
10.1103/PhysRevLett.101.120402
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the threshold detection efficiency for a loophole-free Bell experiment using an $n$-qubit Greenberger-Horne-Zeilinger state and the correlations appearing in the $n$-partite Mermin inequality is $n/(2n-2)$. If the detection efficiency is equal to or lower than this value, there are local hidden variable models that can simulate all the quantum predictions. If the detection efficiency is above this value, there is no local hidden variable model that can simulate all the quantum predictions.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:23:46 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 19:42:28 GMT" }, { "version": "v3", "created": "Wed, 23 Jan 2008 19:33:19 GMT" }, { "version": "v4", "created": "Wed, 9 Apr 2008 23:03:55 GMT" }, { "version": "v5", "created": "Tue, 16 Sep 2008 14:30:32 GMT" } ]
2009-07-28T00:00:00
[ [ "Cabello", "Adan", "" ], [ "Rodriguez", "David", "" ], [ "Villanueva", "Ignacio", "" ] ]
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712.3269
Houri Ziaeepour
Houri Ziaeepour, Stephen T. Holland, Patricia T. Boyd, Kim L. Page, Samantha Oates, Craig B. Markwardt, Peter Meszaros, Neil Gehrels, Francis E. Marshall, Jay Cummings, Mike Goad
GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions
17 pages; 9 figures; Accepted for publication in MNRAS
Mon.Not.Roy.Astron.Soc.385:453,2008
10.1111/j.1365-2966.2008.12859.x
null
astro-ph
null
The early optical emission of the moderately high redshift ($z=3.08$) GRB 060607A shows a remarkable broad and strong peak with a rapid rise and a relatively slow power-law decay. It is not coincident with the strong early-time flares seen in the X-ray and gamma-ray energy bands. There is weak evidence for variability superposed on this dominant component in several optical bands that can be related to flares in high energy bands. While for a small number of GRBs, well-sampled optical flares have been observed simultaneously with X-ray and gamma ray pulses, GRB 060607A is one of the few cases where the early optical emission shows no significant evidence for correlation with the prompt emission. In this work we first report in detail the broad band observations of this burst by Swift. Then by applying a simple model for the dynamics and the synchrotron radiation of a relativistic shock, we show that the dominant component of the early emissions in optical wavelengths has the same origin as the tail emission produced after the main gamma ray activity. The most plausible explanation for the peak in the optical light curve seems to be the cooling of the prompt after the main collisions, shifting the characteristic synchrotron frequency to the optical bands. It seems that the cooling process requires a steepening of the electron energy distribution and/or a break in this distribution at high energies. The sharp break in the X-ray light curve at few thousands of seconds after the trigger, is not observed in the IR/optical/UV bands, and therefore can not be a jet break. Either the X-ray break is due to a change in the spectrum of the accelerated electrons or the lack of an optical break is due to the presence of a related delayed response component (Abbreviated).
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:24:27 GMT" } ]
2009-06-23T00:00:00
[ [ "Ziaeepour", "Houri", "" ], [ "Holland", "Stephen T.", "" ], [ "Boyd", "Patricia T.", "" ], [ "Page", "Kim L.", "" ], [ "Oates", "Samantha", "" ], [ "Markwardt", "Craig B.", "" ], [ "Meszaros", "Peter", "" ], [ "Gehrels", "Neil", "" ], [ "Marshall", "Francis E.", "" ], [ "Cummings", "Jay", "" ], [ "Goad", "Mike", "" ] ]
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712.327
Manfred Cuntz
S. H. Saar, M. Cuntz, V. L. Kashyap, J. C. Hall
First Observation of Planet-Induced X-ray Emission: The System HD 179949
3 pages, 1 figure; Exoplanets: Detection, Formation and Dynamics, IAU Symposium 249, eds. Y.-S. Sun, S. Ferraz-Mello, and J.-L. Zhou (Cambridge: Cambridge University Press)
null
10.1017/S1743921308016414
null
astro-ph
null
We present the first observation of planet-induced stellar X-ray activity, identified for the HD 179949 system, using Chandra / ACIS-S. The HD 179949 system consists of a close-in giant planet orbiting an F9V star. Previous ground-based observations already showed enhancements in Ca II K in phase with the planetary orbit. We find an ~30% increase in the X-ray flux over quiescent levels coincident with the phase of the Ca II enhancements. There is also a trend for the emission to be hotter at increased fluxes, confirmed by modeling, showing the enhancement at ~1 keV compared to ~0.4 keV for the background star.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:45:31 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 21:30:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Saar", "S. H.", "" ], [ "Cuntz", "M.", "" ], [ "Kashyap", "V. L.", "" ], [ "Hall", "J. C.", "" ] ]
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712.3271
H. J. Carmichael
Changsuk Noh and H. J. Carmichael
Disentanglement of Source and Target and the Laser Quantum State
4 pages, 1 figure
Phys. Rev. Lett. 100, 120405(2008)
10.1103/PhysRevLett.100.120405
null
quant-ph
null
Disentanglement of a laser source from its target qubit is proposed as a criterion establishing the laser quantum state as a coherent state. It is shown that the source-target density operator has a unique factorization in coherent states when the environmental record monitoring laser pump quanta is ignored. The source-target state conditioned upon the complete environmental record is entangled, though, as a state of known total quanta number (source plus target).
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:33:54 GMT" } ]
2008-09-24T00:00:00
[ [ "Noh", "Changsuk", "" ], [ "Carmichael", "H. J.", "" ] ]
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712.3272
Ilarion Melnikov
Jock McOrist and Ilarion V. Melnikov
Half-Twisted Correlators from the Coulomb Branch
21 pages, LaTex; typos corrected; some discussion added
JHEP 0804:071,2008
10.1088/1126-6708/2008/04/071
EFI-07-40
hep-th
null
We compute correlators of chiral operators in half-twisted (0,2) supersymmetric gauged linear sigma models. Our results give simple algebraic formulas for a (0,2) generalization of genus zero Gromov-Witten invariants of compact toric varieties. We derive compact expressions for deformed quantum cohomology relations and apply our general method to several examples.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:34:34 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 20:08:25 GMT" }, { "version": "v3", "created": "Tue, 12 Feb 2008 21:36:28 GMT" } ]
2014-11-18T00:00:00
[ [ "McOrist", "Jock", "" ], [ "Melnikov", "Ilarion V.", "" ] ]
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712.3273
Shabnaz Pashapour
CDF Collaboration: T. Aaltonen, et al
First Measurement of the Fraction of Top Quark Pair Production Through Gluon-Gluon Fusion
6 pages, 2 figures, Submitted to Phys.Rev.Lett, added 95% CL upper limit
Phys.Rev.D78:111101,2008
10.1103/PhysRevD.78.111101
FERMILAB-PUB-07-665-E
hep-ex
null
We present the first measurement of the fraction of top quark pair production through gluon-gluon fusion. We use 0.96/fb of s**(1/2)=1.96 TeV p-pbar collision data recorded with the CDF II detector at Fermilab. We identify the candidate t-tbar events with a high-energy charged lepton, a neutrino candidate, and four or more jets. Using charged particles with low transverse momentum in t-tbar events, we find the fraction of top quark pair production through gluon-gluon fusion to be 0.07+/-0.14(stat)+/-0.07(syst), corresponding to a 95% confidence level upper limit of 0.33, in agreement with the standard model NLO prediction of 0.15+/-0.05.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:36:32 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 13:34:48 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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712.3274
Dirk Kussin
Dirk Kussin
Parameter curves for the regular representations of tame bimodules
13 pages, to appear in J. Algebra. Typos corrected
null
10.1016/j.jalgebra.2008.05.022
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results and examples which show that the consideration of a certain tubular mutation is advantageous in the study of noncommutative curves which parametrize the simple regular representations of a tame bimodule. We classify all tame bimodules where such a curve is actually commutative, or in different words, where the unique generic module has a commutative endomorphism ring. This extends results from [14] to arbitrary characteristic; in characteristic two additionally inseparable cases occur. Further results are concerned with autoequivalences fixing all objects but not isomorphic to the identity functor.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:41:35 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 16:14:25 GMT" }, { "version": "v3", "created": "Mon, 16 Jun 2008 20:03:48 GMT" } ]
2008-06-16T00:00:00
[ [ "Kussin", "Dirk", "" ] ]
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712.3275
Sean Sather-Wagstaff
Anders J. Frankild, Sean Sather-Wagstaff and Amelia Taylor
Relations between semidualizing complexes
final version, to appear in J. Commutative Algebra, 27 pages, uses XY-pic
null
null
null
math.AC
null
We study the following question: Given two semidualizing complexes B and C over a commutative noetherian ring R, does the vanishing of Ext^n_R(B,C) for n>>0 imply that B is C-reflexive? This question is a natural generalization of one studied by Avramov, Buchweitz, and Sega. We begin by providing conditions equivalent to B being C-reflexive, each of which is slightly stronger than the condition Ext^n_R(B,C)=0 for all n>>0. We introduce and investigate an equivalence relation \approx on the set of isomorphism classes of semidualizing complexes. This relation is defined in terms of a natural action of the derived Picard group and is well-suited for the study of semidualizing complexes over nonlocal rings. We identify numerous alternate characterizations of this relation, each of which includes the condition Ext^n_R(B,C)=0 for all n>>0. Finally, we answer our original question in some special cases.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:44:33 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 19:02:30 GMT" } ]
2008-03-07T00:00:00
[ [ "Frankild", "Anders J.", "" ], [ "Sather-Wagstaff", "Sean", "" ], [ "Taylor", "Amelia", "" ] ]
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712.3276
Andrea Wulzer Dr
Alex Pomarol, Andrea Wulzer
Stable skyrmions from extra dimensions
20 pages, 3 figures
JHEP 0803:051-051,2008
10.1088/1126-6708/2008/03/051
UAB-FT-636
hep-th hep-ph
null
We show that skyrmions arising from compact five dimensional models have stable sizes. We numerically obtain the skyrmion configurations and calculate their size and energy. Although their size strongly depends on the magnitude of localized kinetic-terms, their energy is quite model-independent ranging between 50-65 times F_pi^2/m_rho, where F_pi is the Goldstone decay constant and m_rho the lowest Kaluza-Klein mass. These skyrmion configurations interpolate between small 4D YM instantons and 4D skyrmions made of Goldstones and a massive vector boson. Contrary to the original 4D skyrmion and previous 5D extensions, these configurations have sizes larger than the inverse of the cut-off scale and therefore they are trustable within our effective 5D approach. Such solitonic particles can have interesting phenomenological consequences as they carry a conserved topological charge analogous to baryon number.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:56:32 GMT" } ]
2009-12-15T00:00:00
[ [ "Pomarol", "Alex", "" ], [ "Wulzer", "Andrea", "" ] ]
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712.3277
Mustafa Cenk Gursoy
Mustafa Cenk Gursoy
On the Capacity and Energy Efficiency of Training-Based Transmissions over Fading Channels
null
null
null
null
cs.IT math.IT
null
In this paper, the capacity and energy efficiency of training-based communication schemes employed for transmission over a-priori unknown Rayleigh block fading channels are studied. In these schemes, periodically transmitted training symbols are used at the receiver to obtain the minimum mean-square-error (MMSE) estimate of the channel fading coefficients. Initially, the case in which the product of the estimate error and transmitted signal is assumed to be Gaussian noise is considered. In this case, it is shown that bit energy requirements grow without bound as the signal-to-noise ratio (SNR) goes to zero, and the minimum bit energy is achieved at a nonzero SNR value below which one should not operate. The effect of the block length on both the minimum bit energy and the SNR value at which the minimum is achieved is investigated. Flash training and transmission schemes are analyzed and shown to improve the energy efficiency in the low-SNR regime. In the second part of the paper, the capacity and energy efficiency of training-based schemes are investigated when the channel input is subject to peak power constraints. The capacity-achieving input structure is characterized and the magnitude distribution of the optimal input is shown to be discrete with a finite number of mass points. The capacity, bit energy requirements, and optimal resource allocation strategies are obtained through numerical analysis. The bit energy is again shown to grow without bound as SNR decreases to zero due to the presence of peakedness constraints. The improvements in energy efficiency when on-off keying with fixed peak power and vanishing duty cycle is employed are studied. Comparisons of the performances of training-based and noncoherent transmission schemes are provided.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:55:29 GMT" } ]
2007-12-20T00:00:00
[ [ "Gursoy", "Mustafa Cenk", "" ] ]
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712.3278
Sergey Storchak
S. N. Storchak
On geometrical representation of the Jacobian in a path integral reduction problem
8 pages
null
10.1016/j.physleta.2008.09.017
null
math-ph math.MP
null
The geometrical representation of the Jacobian in the path integral reduction problem which describes a motion of the scalar particle on a smooth compact Riemannian manifold with the given free isometric action of the compact semisimple Lie group is obtained. By using the formula for the scalar curvature of the manifold with the Kaluza--Klein metric, we present the Jacobian as difference of the scalar curvature of the total space of the principal fibre bundle and the terms that are the scalar curvature of the orbit space, the scalar curvature of the orbit, the second fundamental form of the orbit and the square of the principle fibre bundle curvature.
[ { "version": "v1", "created": "Wed, 19 Dec 2007 20:57:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Storchak", "S. N.", "" ] ]
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